Intel G3258 overclocking help
Box is a G3258 on MSI Z97 PC Mate ($99 combo from Microcenter couple years back), and currently a GTX960 hooked up to a 4K Sony TV. It's my HTPC and gaming box. Been running stock with absolutely no issues. I'm able to get it running at 4.2GHz at 1.2v, uncore at 3.8GHz on auto voltage. Temps are mid to high 60's on load on the stock Intel cooler. All is fine when running games and Prime95. The problem I'm running into is random lockup when running Media Center to watch TV. The screen would just completely blank out. It only happens when watching TV and videos. This is making no sense to me, that it runs fine running heavy loads, but not on light load. What am I missing? I do realize I probably will need to upgrade the CPU, but I wanna see how the G3258 will perform first.
TLDR: G3258 at 4.2GHz with 3.8GHz Uncore runs fine on heavy load, but random freezes (screen blanks out totally on random solid color) when watching videos. What could be the issue?