Reliance Standard is insitent upon holding up my benefit checks.

I have been disabled since Jan of 2010. In December of 2014, Reliance Standard began a medical review. To date, they have not denied me but they file an extension each month to pay my benefits for that month. It is very difficult living with pain and wondering if you are going to receive a benefit. Each time I visit my doctor which is now approximately every three months they start the evaluation over. How long before this is considered harassment? The last time they denied my benefits, I was out of a check for almost a year. I filed my appeal and won. This was in 2012. Now two years later, they are just holding up my checks and making them late due to this new evaluation. I think four months is long enough to determine that my condition has not gotten any better.