Bad gps since two weeks...

Hi, 

i was always astonished how good the gps on the venu sq2 works. Very fast gps fix and very accurate...

But in the last two weeks, i had problems to get the gps fix (nearly a minute), and i sometimes loose gps when walking. Even with no clouds...

I have always coupled the venu with my smartphone...

Is there any possibility for me, to fix this ?  Clear caches etc...  Hope it is no hardware problem...

Thanks for notes

Peter