Change the receiver would be the best bet. The genuine receivers have the standard external ariel and an internal ariel so they switch between the two. The Frsky has two vertical ariels so if the signal isn't great then it could explain the inference issue as the backup ariel will be tucked away in the car so it's useless. The ariel from your receiver could have a internal break.
With 2.4 like any digital signal you either have it or you don't unlike FM. So when you're loosing signal your receiver could be picking upa signal close enough that the receiver thinks it's yours. A bit of a long shot.
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Schumacher KF2
Schumacher K2
2011 Muchmore GP 4wd Champion
www.rccarshop.co.uk
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