I didn't get the chance to set original ROM but I did remove overclock. Not only it didn't help but it got worse! In fact, while I was trying different OC settings I noticed that the lower I was setting my clocks, the more unstable my rig became.

My rig usually freezes after a GPU hangs or after a share gets rejected. The clocks I am using and the ROM I am using have been stable for months now with previous drivers and miner version

One more thing I have noticed is that after a rig restart (following a freeze) the miner starts, the clocks and voltages are being set normally but I get~ 3.5% less performance than usual. Once I restart the miner it gets back at 100%. Does anyone else have the same issue?