Why is GPS not working

[AC Question]

Since updating my S7 to Nougat overnight last night I've been having major issues in Pokemon Go. Indoors at work I'm getting the "GPS signal not found" error message about 90% of the time. Before updating to Nougat I don't think I'd ever had the error message come up

 

[In2watercolor]

I am getting this message also, although not 90% of the time.

Since upgrading to Nougat, my GPS location is just wacky...it shows me sprinting in one direction and back regularly...when I'm not moving. In other instances, it shows me somewhere that I am not, which makes it difficult to find Pokemon. On the up-side, I'm hatching lots of eggs.