Remove power spike when restoring power
Many devices will draw a slightly larger load at startup, especially if there are motors involved (ie. fridge/freezer compressors). But even computers will draw more at startup due to all of the devices initializing. 

Likely you are very close to the max capacity of that breaker, and on startup you are exceeding it hence why it trips.

The way to resolve this is to move loads to other circuits, or have an additional circuit installed.