OLED55CX5LB Powering off

[DaveM]

Following a recent update my TV keeps powering off (going into standby) and then takes several minutes to turn back on.

I've been through all the troubleshooting steps including a full reset, unplugging all cables etc.

I ordinarily have 3 devices connected to the TV - a Sony Amp (sky, pc, firestick), a nintendo switch and a PS5. The latter two using eARC for audio.   It has been set up this way since January with no changes or any issues at all.

Recently a software update was pushed out and the issue first started within minutes afterwards and has since it has been a nightmare.  The TV will often go into standby after a few minutes use and will not turn back on.  Even properly pulling the power makes no difference.  The device will go to turn on and then click back into standby with the red light lit.  There has since been another update which I thought may be a fix for the issue but wasn't.

I did find that pulling all the HDMI cables and turning it back on seemed to help it turn on but recently that hasn't been helping either.  The only "fix" is to wait about ten minutes where it will then usually turn on. IF the device stays on for more than 10 minutes it largely seems to then stay on without issue.

I have tried doing various things like disabling CEC control incase something was sending a bad HDMI signal but that hasn't helped and obviously causes issues for the eARC devices.  

Any ideas of anything to try, whether itmight be a s/w issue or is just a hardware failure? Thanks