I've had my Instinct 2 Solar for almost a year now, and it's been pretty good, but I have noticed my pace dropping out intermittently for a while now. I thought it was related to just slow walking pace not registering correctly, but now I also notice the same even if I'm moving. What's especially weird to me is that cadence seems to register correctly, and I'd expect those two to be directly correlated for a non-GPS run. Pretty confused. Any suggestions?