Sounds like a range issue or an install specific issue (since you say it's OK in other cars)
I'd check to ensure that there is no damage to the Rx aerial - even small nicks on the insulation may be detrimental.
Is the Rx aerial routed to extend vertically or have you got it wrapped around anything in the Rx box? If it is wrapped around something, I'd re-route it to go vertically up as far as possible.
If it were a low-voltage issue, then I'd expect it to happen regardless of range.
I'd check the Rx install first - if necessary, swap out the Rx to see if it does the same on a different receiver or even check the Rx range in a different car to see if you can isolate the cause.
What else is different in this install that you could possibly change to see if that does affect it?
Intermittent problems are always the worst type but try to isolate the cause by changing different things. Don't eliminate anything by assumption - but try to go through things methodically.
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