No issues at all with the psu, Im happy with it
I don't know what build you have, so it highly depends on what CPU and components you have if you pc shut downs, do you have, I can't really help if I dont know the specs, but you can look at the TDP of your CPU/GPU and calculate 60% more power for the power supply, so lets say if you have a i3 with a 55W TDP, a 90W power supply (good quality) should be enough.