Originally Posted By: AllPredatorCallsTypical low batteries symptom. Before I would send it in I would insert 8 brand new out of the package Duracell's and confirm it is, or is not, a simple battery issue.
+1
That's what mine did when alkaline batteries got low. The low battery light would flicker on the high pitches.
I switched to Nimh and it appears to have fixed the problem.