Inadequate x2 three months apart

I had a smear in Nov and had an inadequate result so was called back in three months, it was repeated (different nurse) and I’ve just had another inadequate result, again I have to return in three months for another smear but this time my doctor will do it. Obviously with my past problems I’m a little concerned and was actually wondering if the 2 lots of Lletz I had in the past could make it harder to get cells although I have had one clear smear in-between. I’m 44 and have never had an inadequate test in all the years I’ve had them done so this is out of the ordinary for me. I cant blame the nurses technique either as both were done by different nurses but the same ones that have “done” me before. Just wondering if anyone else has had this problem?