There is as of yesterday, another new patch to be download to the main panel that affects the IQ2. This is a second patch, not the 1.51.
I just saw that myself. Getting verification on what it addresses.
That is actually an updated full 1.5.1 release patch. It is a new version of the patch aimed to resolve the issue some users reported with certain sensors reporting malfunction after the update, as well as improved IQ2 connectivity.