That makes sense. Your CPU is crapping out under load (btw the upgrade didnt gave you anything in terms of raw encoding power, since the 8350 is actually halfway decent at encoding and not really slower than i5 4690. Slight edge for the FX CPU here, it can be overclocked and will be even faster than the i5. In games the i5 is better.
If you dont see the buffering circle in the player, then it is your videofeed. To tell you more, we need a fresh log from OBS.