I've been using the Nokia 6.1 Plus for 2 months now. It's a fantastic device apart from a couple of bugs that I've observed.
1) After the last to last firmware update I've noticed a loss of battery life, this hasn't changed even after latest firmware update.
2) The Camera app shows significant lag when opened, hasn't changed after updates.
3) Initially when I bought the phone VOLTE worked perfectly fine, but now while using cellular data it shows 4G but the moment I get a call, it turns to 3G.
4) Certain apps crash at times but this isnt specific to any heavy apps as such, it happens randomly and with any app.