I have had my GWM5610-1 (3159 module) watch for only 20 months and the module has already failed!
I have looked after the watch (even though it's a G-Shock) and have kept it charged up - in fact I've never seen it below 'H'. It sits on a shelf (with my other solar's) where the sun (yep, even in the UK) shines directly onto it, and have regularly worn it outside. It now just goes into its battery saving mode and then resets to 1st January Tokyo time! I'm sure it's not the battery.
What's the point in buying a Solar G so that I can abuse it and I don't need to worry about opening it up to change a battery if it can't take being looked after and the battery goes within 2 years!
My question is (approx) how much will a new module cost?