HTC One M7 stock ROM - random freezes after update to Andoid 5 topic


I have HTC One M7, stock ROM, unbranded, S-OFF only, and I am experiencing random freezes after update to Andoid 5 few weeks ago.
I never had any performance problems before. Now, phone grinds to halt few times a day, I have to wait from 1 to 5 minutes until it unfreezes and is usable, I have a random restart once every ~2 weeks, and 75% of times copying any data from PC (tried Windows 7 and CentOS Linux) to phone freezes the phone completely and only hard reboot helps. Accessing data i.e. movies / music sometime takes a few seconds (but this is minor problem comparing to the previous ones)
Some applications cause parts of the operating system to crash (this is my wild guess as how would I know what is really hapening there)- yesterday I used Skype and phone "restarted" - had HTC One boot up screen on, but still continued Skype conversation for another 10 minutes, had to hard restart phone afterwards as could not hand up or anything else.
I have tried restoring to factory settings - no difference.

Any idea what's wrong? Is this a known issue? Halp.
Tempted to try custom ROM / flashing RUU and never updating to Android 5.

Phone details:
M7_UL PVT SHIP S-OFF RH
CID HTC__001
HBOOT - 1.61.0000
RADIO 4T.35.3218.16
OpenDSP v35.120.274.0718
OS 7.19.401.2




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