RE: Let's talk DX18 here!
Are you sure?
I flew this Kyosho T-33 for two years with no problems.
It's very tight in the radio compartment, everything just stuffed in.
I added the tm1000 and airspeed indicator on top.
When I got to the field it was starting to rain lightly so I had a friend launch it.
Got out a couple hundred feet and flew out of range.
I picked up the pieces and set them on a picnic table and did a range test, it was ok.
Put the pieces in a pile, kind of like in the plane and it failed big time.
I know it was a worst possible installation, but it was only a foamy and it worked for two years.
Lesson learned, don't rush into things, do a range test!
Still wondering why the RF link failed, are you sure the Telemetry doesn't affect things?