Hard to say why it reboots only on multiple lights, unless there is a longer signal going out to address multiple lights. Again, be sure the contacts are very snug and contact the battery directly.
As for dropping ch3: Set a different reciever to ch3, and the original reciever to another channel. If the problem follows the channel, then it could be an issue in the Commander, but if it goes away or stays with the reciever set to a new channel, then it is likely in the reciever. By testing this, we can ensure the right part or parts are corrected the first time.
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