I use a Paradigm 722 and 3 ml reservoirs. Lately I've been getting "No Delivery" messages constantly. Many of these times it's due to a pressure problem in the reservoir (too much pressure in the reservoir and the rod can't push the O ring up and deliver insulin). I know this to be the case because I typically will run a 5 unit prime and will get the "No Delivery" message quickly. Thus I know it's not a plugged canula. Does anybody know how I can alleviate this issue (besides following the instructions in the reservoir box which I've done many times)? Any tricks I should know about getting my insulin into the reservoir without creating a pressure issue?