I've got this trek computer on my LHT. Works intermittently. I've changed all batteries, gotten 3 different wheel magnets, and this thing is not working right. I was approaching mile 200 on the katy trail - 190, 192, 193, 195, and then it stops working, only to start up again 5 miles later. Also, I've been commuting all week as part of bike to work week. Damnedest thing - does not work in the morning, but will work in the evening when I'm riding home.

Any recommendations on what to do? Or recs on new computers?