Thunderbirded

Sometimes when I try to fly my Thunderbird, the heli won't respond to the Tx...

I wait about half an hour, try again...it works...

this happens all the time...

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Another issue...

I try to fly, blades rotate up to about 20% throttle, but when i push the stick any higher, the blades stop...

I repeat, and same result...wait about a half hour...works fine


this doesn't make any sense at all to me...any ideas?