Spektrum 5 channel 2.4GHz radio set

I have purchased one of these due to apparent interference problems at our flying field on 40MHz. Put it in a .40 size pattern model and had a few flights but had an 'incident' where the model had a hard landing and damaged the fuselage. The model suddenly started flying erractically as though suffering from interference. I have 'learnt' a couple of things... 1. Use a 6V battery pack which gives a bigger safety margin over a 4.8V 2. Don't use 'old' Futaba servos with Spektrum sets. I didn't even give it a thought but it seems that Futaba S128 don't necessarily go with Spektrum receivers. Anyway use more modern servos.

The Spektrum is now in a .25 size model and we have flown it on a number of occasions are all is fine (6V battery pack and no S128 servos).