GPS accuracy: non existent

After resolving the bluetooth pairing problem in my other topic with a full reset now i’m facing a new - even more frustrating problem. GPS accuracy is rediculous. Last month i had decent accuracy, now i have none (image attached)

It looks as i am running like an escaped chicken on steroids. 

Earlyer i had the best results with ‘GPS + GALILEO’ and connect ‘every second’
i tried switching to ‘GPS + GLONASS’ and ‘smart’ - it’s the same, bad tracking.

for a €270 watch this is rediculous (second big problem). 
Any help?