I’m just taking a guess here, but when you read about other people having faulty sensors after the update, it seems likely that this is probably the cause.
Here’s an example from Robert Coletti:
So, versions 1.0.2.0 and 1.0.3.0 of the P2 motion sensor and 1.0.1.1 and 1.0.2.0 for the P2 door & window sensor have been revoked, and the following statement has been issued to users by support: