It's happening to others too.
There is a workaround in this thread, but it is not ideal. I really hope LastPass get this sorted asap.
LasPass iOS app constantly logging me out and aski... - LogMeIn Community
Glad I found this thread. I’ve been having this same problem for over 3 months now. I’ve been in contact with support and sent numerous diagnostic logs to them and still not resolved. All they keep saying is their engineering team is working on it. It is beyond frustrating now and I will likely be moving to another PW manager when my subscription ends next month, unless they miraculously come up with a fix. Any suggestions on a new PW manager?