The E3200 reboots randomly when I use a certain iPad around the house when the connection changes from the G3100 router to the extender. I finally found the problem to be that the name of the iPad contained a space. I renamed the iPad with one word, and removed the old name from any listing on My Verizon and the Apple registration. After a few reboots, and a wait for Verizon to update their files, the system is running great.
Hope this helps somebody.