Ah, i think i didn’t explain well enough 
Say i’m taking the phone out of my pocket holding it like this, this will trigger fingerprint tries several times per second and near instantly lock out the fingerprint unlock:
Was never an issue on the G5 but happening often here.
Only a minor thing, but still mildly annoying
The actual recognition when trying to unlock the phone is damn impressive though, far better than on my old phone 
Fixes could possibly be having the sensor very slightly recessed as in the G5, or having a longer timeout between fingerprint sensor retries.
EDIT: after a little testing, the LG has a slightly recessed sensor, but more importantly, if you hold the phone in such a way as to trigger the fingerprint sensor with a part of your finger that is not your finger-tip it triggers once, and does not retry until you move your finger away from the sensor, the FP3 just retries until it locks out, this is a software issue that is fixable i think