Problems with Shanling CDT-100 remote

I am on my second remote for my CDT-100 and now the second one stopped working. Just, out of the blue, no logical explanation. Anyone else with similar problems, if so, What did you do? These remotes handled with care, no dropping or misuse.
Battery is not the problem
Did you try pressing button more than a fraction of a second, some remotes are funny like that. Gotta hold em down a bit.