Recently my R7 .22 started playing up. No problems then first of 3 was low shot count. Run low on its 3rd mag (fac with small buddy bottle) where normaly its OK & get possibly 4 mags worth of air. I fill to 190 simply to fill all my rifles the same rather than keep tabs on individual rifle pressures. 2nd of 3 the 1st mag was OK then lost air due to the buddy bottle come loose. 3rd of 3 1st mag OK, each single shot I nipped the buddy bottle up, verry little movement but it was there. 2nd mag first shot was OK but air dropped after the first shot more like plummeted. I first suspected the buddy bottle valve & will check it later. Is there anything else it could be ? It appears to hold air when not in use. Allthough it's fac, fast flow valve, it's the same as a legal limit fault. Any ideas ? I don't know / understand the workings of a pcp, just slowly learning.