Sounds like what I experienced increasingly often with progressive firmware updates.
The issue seems to be related to the comm exception timeout function. A settings restore from online or a local backup would almost always kick it back into action.
The solution is modifying the L_Powermax,lua file to disable the comm exceptions parameter. I have not had a startup failure since.
Here is a related link, and attached is my modified .lua. It has the changes that tunnus implemented in his attachment. L_Powermax.zip (23.1 KB) I suggest backing up your old one before overwriting with this one. Rename it without the parentheticals and copy it to your vera.