I was optimising a code which ran normally at around 64 seconds on plain run and around 57 seconds after optimisation. This i did a few times. But lately, the same run of the program is taking around 140 seconds all of a sudden. Although once or twice it did go back giving 57 seconds, now it remains at the other state, showing 140. i'm pretty sure its not a code related problem, because i tested it on other systems. So it must be something related to the board. Also, the board is heating up a lot and crashes. i'm not sure if overheating of the board is the primary cause for its slow run. I'd be thankful for any advises or help with regard to the above matter. Besides, how do i reduce heating issues of the board on prolonged run. Thank you.