convoy m3 issues almost since it was new

hello, I have had issues with this flashlight for a while. issues started very soon after I got it when going full max brightness and it would quickly switch off within 10-15 seconds , now with two fully charged shockli 5500mah imr 30A batteries it will not even go to the lowest brightness setting it will switch off fast or go off with a very short time. where do I start? what should I look at?

Well I took it apart. thought I took it apart before, does the white thermal paste being all over the board an touching capacitors, resistors and such ever cause any issues?

Thermal grease should NOT be spread on the driver side!

Ok thanks. I will clean it up and reapply a new pad. Apparently from the factory it was like this or the paste spread when it got hot.