The release notes for V1.58 state that the problem of the PLM freezing up was found and it seems having to do with mixing Insteon and X10 commands in rapid succession. That would explain why it has been working for me since I had spread the timers 1 minute apart.
It states that PLM version 75 fixes the problem. Is this a software that can be updated or is it a hardware revision? How do I determine my PLM version?
I presume PLM revision 75 that is projected to fix the freeze problem is a PLM firmware update (versus a PLM hardware change), but the firmware in a PLM is not field upgradeable. I just received one of the HL2 enabled PLMs from Smarthome a week or two ago and it is revision 72. No idea when Smarthome will start shipping revision 75. Also don’t know how to retrieve the revision number of the internal PLM used by most SHN products, or even if it is possible in the field.