I have been riding for over a year now, and have covered some good distances recently. However, I feel as though I am suddenly marrooned at home, as everytime I take the bike out, my rear tire goes instantly flat everytime I hit any kind of pot hole or bump. Something is obviously wrong somewhere, and it is costing me a fortune in innertubes. it's now at the stage where I am on the bike less than five minutes and it happens. I am totally bewildered as to why this has started to happen, but it must be into double figures now, and innertubes being 5 quid a piece, I am stuck at home and skint to boot.
Any help and or advice on this matter would be greatly appreciated. TIA