Lurker out... anyway, I think I know the reason but would like a confirmation. My PO 8500 keeps good time at <+1 sec/day. Today at work I took a shower midday so I locked my PO in my steel (I presume) file cabinet. Hour later I came back and noticed it skipped 3 seconds ahead. I'm fairly sure it's cuz I put it in the steel file cabinet. Now 10 hours passed and my PO kept near perfect time since. Has anyone else experienced this or can help explain? Is it to be expected that steel will affect timekeeping? Either way, I'll definitely keep it away from those environments in the future.