Still suffering from random phones timing out on the account registration upon phone booting up

[ElementalWindX]

The setup:

1) newest 3cx hosted in vultr data center
2) client has coax cable internet with Sophos XG 135 firewall and Ubituiqi Unifi Poe switch.
3) All phones are hard wired and work perfectly except 1. This 1 phone has been working fine for 2 months. (This is a 3 month old system so far).

I've gone through and removed the sip module from sophos as well as increased the udp timeout stream to 350.

I've put 2 firewall rules in for LAN to WAN and WAN to LAN allowing unfiltered everything from/to the PBX.

I've power cycled the phone and went into the gui and rebooted the phone. I've reprovisioned the phone.

When the phone reboots, nothing shows up in the event log on the dash board about the phone at all.

Sophos XG firewall logs show all traffic between the phone and the PBX is allowed and passing for both port 5060 and 443. In fact there is no traffic being denied at all from the phones IP in the firewall logs.

Any ideas wtf could be going on with this phone?

 

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Is it every time you reboot this phone?

Not sure what you've tried already.

Have you tried another port on the PoE switch?

Factory reset the phone?

 

[ElementalWindX]

So I had the user physically unplug the power/network from the phone for 5min and plug it back in. NOW IT WORKS. W-t-F -_-

 

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[ElementalWindX]

Ok bringing this back from the dead. Have another office where this is happening again. Now I want to throw tables. I restart my unifi switch that powers them and it doesn't fix it. Restart the Sophos XG router, that doesn't fix it. They just seem to "fix themselves" whenever they want to. Really wanting to bash my head into a wall right now.

This is probably the 6th or 7th time this has happened. These are fanvil x6u phones.