Why do my Amazon apps keep re-installing?

A

AC Question

Amazon apps keep re-installing

I've been using a Note Edge, SM-N915V, Android 5.0.1, Kernel 3.10.40, for about 4 months now. No real problems until recently. Now it seems all the apps from the Amazon app store, included bundled apps, keep re-installing themselves. Sometimes two or three time per day.
I've not tried any fixes as yet. Thought I'd get some opinions first.
Thanks in advance.