On several recent rides I've had SWTracker/Spotwalla fail. The tracking gets interrupted and fails to resume. Thankfully none of these rides needed to be certified; but my wife likes to track my progress to make sure I reach my destination. I know it's not an SWTracker/Spotwalla problem. It's my phone. Can't seem to pinpoint the problem. Is it when I make a phone call, send a text, etc., that tracking is interrupted? Then tracking does not resume for the remainder of my ride. I have used SWTracker successfully for many certified rides with no problems at all. But now I can't understand the problem with my own phone.