Power levels and reported data looks OK, but the erratic packet loss makes me suspect there's noise ingress at certain frequencies. When the hub is rebooted it picks a new set of frequencies for the channels it uses, and will tend to pick "clean" ones. Over time the hub will switch frequencies in response to the CMTS managing the traffic from all the other VM hubs, and I suspect it is landing on one that has a noise ingress problem from a particular source (this can be emergency services radio, ham radio, DAB or DTTV broadcast, aviation radio systems etc). If that were the case then we should see post-RS (uncorrected) error counts against the problem frequency. However, due to faulty firmware the Hub 4 often doesn't display the error counts (see how your is all zeroes? Singularly improbable that there would be not even a single pre-RS error), although a hub restart will not only choose new frequencies, it clears the error counters.
Check that all coax connections are properly fitted and any securing nuts are finger tight, that's the limit of what you can do. If that doesn't resolve it then it needs a technician to investigate, but be aware that intermittent faults can be a devil to find and fix, so you may need to be persistent. You can wait on the forum staff to take a look and advise, or you can try phoning it in, but bearing in mind VM's well deserved reputation for their telephone support.
Thank you for getting back to us @Nagasaki. Glad to hear the packet loss has been okay since the reboot.
I have checked your connection and equipment, and all levels are fine. I can only see 3 disconnections from the last month, the most recent being the 16th when you completed the reboot. We do recommend regular reboots as it allows your hub to clear any issues it may build up through hours/days of continual use, and reset any settings that may also be responsible for any issues. Your speeds are looking great on both upload and download, really consistent over the last month; averaging at about 1136 download and 51.48 upload.
If you do have any further issues please do get back to us so we can look into it again for you!