Hi All,
I've managed to do some further tests as below and need help now as to what the cause might be.
1. Reset the SH3 factory default
2. Only connected one wired device to the PC and did a speed test - download speed was 490-510mbps which is what I should be exoecting
3. Disconnected everything and put the SH3 in Modem mode and connected it to my Netgear Nighthawk X6 R8000 router and after rebooting everything did a speed test and now get 180-190mbps download speed.
Therefore, there is something to do with the router and I'm not sure what. The router has the latest firmware installed and I have not made any config config changes.
I had this exact problem when I first upgraded to the M500 speed and was solved by installing the latest firmware on the router but now had the same issue again since noticing just before the Christmas period.
Therefore would appreciate of some help here.
Thanks