Sometimes, my Instinct Standard turns crazy...

I don't understand what happen about my Instinct Standard... every new update it works worst, I think... now, it's 19.01 version. I don't know if the intense heat in this summer time is the reason for it, but sometimes, in my workouts, GPS distance is wrong (more few kms than Strava workout, i.e.), and... what about altimeter & barometer...? It's a nitghmare... most of you know what I'm talking about.If I don't trust him... bad luck?