Yes, I have had both of those problems. I'm using Android on Verizon, however. The failure to recalculate has been fairly consistent lately and has been brought up in the forums.
The offset position problem I also had recently as well, but only once. If I open Google maps while this is happening, it shows the same erroneous location, so when it happens to me it seems to be a GPS issue.
Regional Coordinator: Mid-Altantic, US
Verizon, Droid Razr Maxx HD, Android 4.1.2, Waze 18.104.22.1689