Stacked Sswitches momentary drops

We have three GS752TXS switches stacked together. All three switches will drop the internal connections tol all of our computers for usually less than a minute and then restore the connections without any intervention on my part. We placed a camera in front of the switch stack and when the problem occurs all the connection lights go off on all three switches. This can happen once or twice a day and most of the time it does not happen during business hours. Occasionally it will happen during business hours but usuall occurs after hours. I am not sure what to do other than a reboot to try and fix this. There are no erros for packets being dropped from connected computers so I have no idea what can cause this.