Audio dead after 2h and phone lags/freezes

Hello,
Im having big troubles with my HTC ONE M7 as Audio goes off after about 2 hours. Then the phone starts laging/freezing and there is no sound at all. My alarm didnt go off, I cant phone somebody. But when I restart the device, everything works alright again. So it has to be a software issue.

Any ideas? I tried do a RUU but it always "Fastboot crashes" while flashing.
Also tried different roms, different kernels(now ElementalX-m7-14.12)
Currently I got ARHD 71 with HBOOT 1.57 device is rooted, S-off, SuperCid etc.
I thought maybe there is an app which causes the problem but I deinstalled everything there was.
Recently I did a Simunlock with SIIEMPI method (config.dat file executed in Bootloader).

I would really appreciate any help, cause Im clueless whats the problem.

jeb101 said:

Did you by any chance change the voltage on your phone? If so change it back to stock, baseline 900mV

I would also remove the SimUnlock, as that could cause issues, considering you are back to normal after a reboot. And please, cover your IMEI number and Serial Number!!

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Thanks for your reply! Voltage level is stock. Well I need that unlock for my sim card as its from a different carrier.
But how could I remove the simunlock? Its strange that for 2h or so everything is normal and afterwards nothing works...