I am slower than before some major medical stuff 2 years ago but I think when you hit 68 you never really get back 100% I am more than happy to be at 90% plus and I am thankfull for what I can do and don't worry about what I cannot do. Anyway it is the electronics that are messing up your info. I have the same problem with my phone's GPS and the rpm meters on the spin bikes read way too low. It might be solar flares