Site problems with pump

Hi guys,
I wrote a blog about this-I'm wondering if anybody has had continuous site problems when using the pump. Everything was going fine in the summer, then all of a sudden I started having pump blocks in the fall (currently using Minimed-formerly using the Mio set then changed to the Silhoutte). Changing the sets worked ok for some time and then the blocks started happening again. I anticipate a block at least once in two weeks these days. I'm going to try to get a pump trainer to go over with me how I put my sites, but I'm really worried-my A1C jumped from 7.2 to 8.2%. My blood sugars that were once below 150 are now erratic ranging from as low as 40s to as high as 390s. I feel so upset, not sure how I've gone from fixing things to making them go wrong again. Any insight is appreciated (PS: I'm not a new pumper)