Tonight I went for testdive no 4 with version 7 and it resulted in a suspected CO2 hit and I had to abort the dive on bailout. The canister had been used 4 times before and had 135 minutes. The incident happend after 25 minutes on the scrubber. The bailout went well and I have decided to put a scrubber limit on 140 minutes for the hunchback scrubber on repetive dives and cold water. My buddy was next to me during the whole dive and gave good feedback afterwards. Another lesson to the book. The saga goes on! Safe diving out there!