Temperature issues after PC cleaning.

[MAFiA9792]

A few weeks back I planned on opening my PC and cleaning the heat-sink and fans as the CPU cooler stock fan was running at 6000RPM and giving lot of noise.

After the cleaning was done I applied new thermal paste and restarted my system but since that day on I am seeing random freezing/crashing/not responding issues with my Dota2.

It is completely random as sometimes it will happen mid-game sometimes right after launch.
Also when the game freezes just the video stops and the audio ( game sound, discord etc. ) will run fine.

As I was using a small case I upgraded my Cabinet and added multiple fans for a good air flow.

I am using Open Hardware Monitor to monitor the temps.
The Motherboard shows 3 temperatures T1-40-45° C ; T2- 45-55° C ; T3-50-60° C. It would be good to know which part is T1,T2 and T3.
CPU temp: 45-50° C.
GPU Temp: 55-60° C.
The case fans are at 1550-1600RPM. I've set my stock cooler to run above 90% ( 5000RPM+ ) using Speedfan while gaming.

As far as the T3 stays below 60C everything is fine but as soon as it peaks over 61C  even for a second my game will crash or freeze.

I do not have any previous data at which my system was running before the upgrades as well as the cleaning.

Could you please help me out with this.

 

My system config:
MB: GA 78LMT-USB3 rev6
Processor: FX 8350 with Stock cooler
GPU: Nvidia GTX 770
PSU: Cooler master 550W.
RAM: 2x 4GB DDR3. ( only 2 slots working )
Case: Gigabyte C200.
Case fans: 1 exhaust at the rear (came with the case ) / 2 inlet in the front ( Arctic P14 PWM ) / 2 exhaust at the top ( Arctic P14 PWM ).