SYNC Timing Synchronization failure while in vr

[LiamRC]

to keep this long story short; 

I have attempted to use my VR headset and play online vr games. Every time I go into any online vr game (certain ones will allow you to start in desktop, others will be in vr only), I get a SYNC Timing synchronization failure within 3 minutes of loading into the game. 

Network Log:  

Time	Priority	Description
26-03-2023 05:10:10	warning	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=**:**:**:**:**:bd;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
26-03-2023 05:09:50	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=cc:**:**:**:**:bd;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
26-03-2023 05:09:38	critical	Cable Modem Reboot due to RG crash
26-03-2023 04:57:06	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:bd;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
26-03-2023 04:56:54	critical	Cable Modem reset to Factory Default via reset button

Before I am asked if I have attempted some of these, I will list what I have already tried below;

change router to modem mode and use a different router - this did not help, in fact this made the issue occur more on normal online games like CSGO, COD:MW2 and Destiny 2

reconnect co-axle to wall and router - attempted this a few times to no positive result. 

reset/reboot router - I have done this a few times throughout the process, this did not fix the issue.

turn off 5Ghz - attempted and did not help, same with turning off 2.4Ghz 

connect directly to the router - attempted this is both router and modem mode.

Is this a recurring issue? Only in vr games specifically, this does not normally happen in most of my other games, but this does affect my work.

If you are wondering which router I am using, I am using the hub 5.

If anyone has any ideas on why this happens, it would be nice to know.

[Adduxi]

Can you post the power levels and the full network log please.

Also setup a BQM to record and monitor the circuit.   www.thinkbroadband.com/ping

Once done post the link to the shared live graph.

[LiamRC]

Hey Adduxi, 

Sorry for the late reply, I was trying to get a bit of a log before I would post it. I have found out that it happens more when there is live streamed music inside a game (a good example would be watching a stream in vr)

BQM:

https://www.thinkbroadband.com/broadband/monitoring/quality/share/297c12e6b9eb345867629618904513b6c1...

Full Log:

Time Priority Description

28-03-2023 22:45:56	notice	REGISTRATION COMPLETE - Waiting for Operational status
28-03-2023 22:45:52	notice	US profile assignment change. US Chan ID: 11; Previous Profile: 13; New Profile: 12 13.;CM-MAC=cc:**:**:**:**:bd;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-03-2023 22:45:46	notice	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=cc:**:**:**:**:bd;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-03-2023 22:45:34	warning	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=cc:**:**:**:**:bd;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-03-2023 22:45:32	notice	Honoring MDD; IP provisioning mode = IPv4
28-03-2023 22:45:17	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=cc:**:**:**:**:bd;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
28-03-2023 22:45:05	critical	Cable Modem Reboot due to RG crash
26-03-2023 05:09:50	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=cc:**:**:**:**:bd;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
26-03-2023 05:09:38	critical	Cable Modem Reboot due to RG crash
26-03-2023 04:57:06	critical	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=cc:**:**:**:**:bd;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
26-03-2023 04:56:54	critical	Cable Modem reset to Factory Default via reset button

[DylanK01]

What VR headset are you using? I've noticed when using external tracking base stations/lighthouses, that they can cause so much 2.4 GHz interference that wifi can completely cut out across the house. Of course, this wouldn't explain the troubleshooting steps you've tried not working but I wonder if that could be causing issues somehow.

[IPFreely]

https://community.virginmedia.com/t5/QuickStart-set-up-and/Cable-Modem-Reboot-due-to-RG-crash/td-p/5... may be related.

[LiamRC]

I am using a 2018 HTC Vive.

I originally thought it might be the lighthouses and earlier today when I came home from work I attempted to use a certain vr social game as a good test, I got the same results with all the vr unplugged from the wall and pc. 

Sadly to no avail, I have still retained the issue, the only good thing is that it has not happend on most of the normal games I play, shame MMO's are still causing the issue sometimes.

[LiamRC]

I did look at that but the Power(dbmv) on all my DS bonded channels are between 0-1.1db (only channel 26 being 1.1 and second highest being channel 22 at 0.9db)

DS Table:

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	331000000	0	42	QAM 256	25
2	139000000	0.2	42	QAM 256	1
3	147000000	0.2	42	QAM 256	2
4	155000000	0.4	42	QAM 256	3
5	163000000	0.5	42	QAM 256	4
6	171000000	0.2	42	QAM 256	5
7	179000000	0.5	42	QAM 256	6
8	187000000	0.3	42	QAM 256	7
9	195000000	0.2	42	QAM 256	8
10	203000000	0.6	42	QAM 256	9
11	211000000	0.1	42	QAM 256	10
12	219000000	0	42	QAM 256	11
13	227000000	0.2	42	QAM 256	12
14	235000000	0.5	42	QAM 256	13
15	243000000	0.7	42	QAM 256	14
16	251000000	0.3	43	QAM 256	15
17	259000000	0.3	42	QAM 256	16
18	267000000	0.1	42	QAM 256	17
19	275000000	0.1	42	QAM 256	18
20	283000000	0.4	42	QAM 256	19
21	291000000	0.6	42	QAM 256	20
22	299000000	0.9	43	QAM 256	21
23	307000000	0.9	42	QAM 256	22
24	315000000	0.5	42	QAM 256	23
25	323000000	0.2	42	QAM 256	24
26	371000000	1.1	43	QAM 256	26
27	379000000	0.7	43	QAM 256	27
28	387000000	0.1	42	QAM 256	28
29	395000000	0.1	42	QAM 256	29
30	403000000	0.3	42	QAM 256	30
31	411000000	0.4	43	QAM 256	31

the RXMER on all DS channels is 42 with 0 pre and post RS errors.

US Table:

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

0	49600000	45.5	5120	QAM 64	1
1	43100000	45.5	5120	QAM 64	2
2	36600000	45.5	5120	QAM 64	3
3	30100000	45.8	5120	QAM 64	4
4	23600000	45.8	5120	QAM 64	5

There is no timeouts on any of the US channels.

[Matthew_ML]

Hey LiamRC, thank you for reaching out and a warm welcome to the community I am sorry to hear this is happening.

I have taken a look at our side and I can't see nothing that should be causing this problem,

What type of VR headset do you have, is a Meta, PS5 one etc? Thanks 

[IPFreely]

He already said it's a 2018 HTC Vive.

His Hub 5 is crashing. Given it's owned by VMO2 I would say that's an issue on VMO2's side. 😊

[LiamRC]

Hi Matthew,

I have a HTC Vive gen 2 from 2018, it is a pc based headset using steam vr. 

I do know it is not caused by the headset as I have tried it different rooms and it also worked fine in my previous home (less than 2 months ago) and in my neighbours apartment. Also this does happen outside of vr on more social games which can be played on vr and on desktop (mouse and keyboard).