While on Grand Cayman, I had a different problem with my XR2 that I purchased (new) almost 2 years ago. Upon activation, 'ALT' would appear on the screen then the computer would immediately power off.
Once home, I did some research and scoured the manual, I could not find an answer. I called Aeris' shop in San Leandro, CA, talked with a tech and had a reasonable diagnosis over-the-phone. He said to send it in because an altitude sensor went on the fritz between The Bahamas and Cayman Islands.
Because Aeris were to begin inventory and holiday schedule, he encouraged me to ship ASAP; I shipped 12/10. Yesterday morning (12/18), I received a NEW XR2 via UPS. Because my XR2 was <2 years old - with proof of purchase - it was under warranty.
I had only one telephone conversation with an Aeris' tech. The guy seemed a bit hurried BUT VERY HELPFUL AND FRIENDLY. He clearly explained the process, gave me an estimate ($) if I could not produce my receipt and followed through exactly as he said he would. Took in my computer but could not fix it; therefore, he sent me a NEW XR2 in return.
I am VERY satisfied with their service. I encourage you to give them a call, but be patient... it's a holiday week.