I feel like a moron, somehow when I was setting up the RTL510 radar in the bike app I switched the GPS mode to Ultratrac: UltraTrac mode is a GPS setting that periodically turns off GPS to save battery power. When GPS is off, the device uses the accelerometer to calculate speed and distance. Speed, distance, and track data accuracy are reduced in UltraTrac mode.

I did a 15 mile ride this morning and everything is back to normal, but thanks for the reply Iride01!