A couple of days ago, I was on my trainer and rocking out to a sufferfest, and I noticed my speed was going in and out while my cadence was going out also. At this point, I figured my battery was dead (i bought my 500 in August of 2010). Now that I changed the batteries, it's still doing it but the cadence is good now. I've checked everything on the sensors, but everything looks to be good.

Anyone have this going on?