Site keeps disappearing and going blue

All of a sudden my main site http://www.neighborhoodcouponclub.com. started to show a blue page and I can’t login. Green Geeks is able to get it to another theme and then I re activate coupon 8.3 again and all the information comes back and then a week later, it happens again. Any ideas what is causing this? I have 8.3 on several sub-domains and so far no problem with them but this is the only site that has been upgraded automatically with green geeks to wordpress 4.4. Is this causing it??? I need to stay with 8.3 because all my sites are set up just the way we need them and I can’t redo everything. Any ideas on what is causing this and how I can avoid it happening again?