Glad the new one is working for you. We retired the PMP 100 series products January of 2016. If it's still under warranty, we will support you if it's a hardware defect of course, but there is also likely a large supply of used (and very affordable) PMP 100 equipment available through third parties...
In addition, I would like to recommend trying our updated PMP 450i version of the 900 MHz product. You can eek out substantially more capacity from this spectrum using the 450. There are many folks on the forum that can share their stories of the migration from PMP 100 to 450 in the 900 MHz band with great success.
Here are a few: