I've been basing my suggestions against an assumption that any half-decent fiddler should know if a problem is due to poor fingering technique. If the problem is happening when strings are fingered, then yes, poor fingering would be a likely contender. But the OP seems to read as though the problem is happening with open strings.

It would be helpful if the original poster would come back and answer some of the questions that have been raised, and indicate whether any of the suggestions that have been made were helpful.

Otherwise I'm just inclined to bugger off and leave him/her to sort it out for themselves.