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Hello, I'm having a recurring problem where I'll use my CPAP effectively for a couple of months, but eventually it always gets to the point where, although the ahi is still under 1, I don't feel as if I'm getting enough pressure. Usually, when everything is working properly, I inhale and the machine forces the air in without much work on my part. When I exhale I feel resistance but if I relax it all works fine. I think this is all normal, but eventually I lose that sense of resistance on exhale and I actually have to work to inhale rather than just let the machine do it. It makes it difficult to fall asleep, and although the ahi doesn't really change I wake up more and feel worse in the morning. I've noticed that replacing the humidifier tank solves this problem, but the NHS insists that they should last at least a year. I'm not able to get past 3 months before I have this issue. I wash the tank and seal daily, as instructed and dry them in front of a fan. Same goes for my mask. (FYI, my minimum pressure is 11.6) I'm gathering that the silicone is degrading and not making as good a seal, but I'm not sure how to avoid this. Can I purchase a replacement gasket? Is there a way to improve the seal after the silicone has begun to degrade? Thanks for your help.