I took my ATpro out for the first time last weekend just for a little bit. Noticed that some of the numbers did not fully show up. Finally was able to get out for about three hours this afternoon. Anytime a number in the 30's came up, I would only get a partial number. Sometimes in the twenty's as well. Many times I would get a target that bell toned, but the Id would be in the 30' with the three broken up. Is this normal operation, or do I have a defective machine? I could not find anything in the manual about what the display should look like.