So, we bought this ridiculously expensive SIM a few years ago and have probably used it for about 30 nights in today.
We went camping in May and I noticed it deflating and we had guests here over the weekend who also said that it was deflating..
We cannot find a hole, however small, anywhere and the valves all seem good.
Does anyone have any ideas? We can't really afford another one and this SIM has meant that I can camp without chronic back pain!