You need to disassemble the watch pal, give it a good clean, leave the module out and the case open, for a day our two, in a place with no moisture, then, put it a new battery give it a ac reset and I think you a a watch there four a few years more!
In last case, buy a used one, cheap with a good module inside, like a dw-6900 our a dw-6600,dw-002,003, every module of this one's fit inside yours!