Once worked site now not working well

Hi
I have made a site with among other Plugins Polylang and Membership.
Suddenly Jetpack stop functioning. I asked in Jetpack support and came to the resolution that a part of my site had crasched.
Probably the crasch was after I used Dropbox backup and run into “possibly out of free disk space in…”
Now Jetpack, Polylang and Membership 2, perhaps some oyher will not work properly any more.

When I started “Dropbox backup” 28.5 2016 it went good for a while but suddenly I got ERROR 500 or something and my site was compleetely locked out. But after a while, perhaps 30 min I could reach it again. It seemed to work fine but Jetpack did not reach my site.

In “[#2683786]: [Jetpack] Changed from test site to official” the doom was “However, none of these errors are related to the XML-RPC file”.

I don’t know where to get help.
My Webhost will not give me any help.

I have made a page in my site with informations of errorlog and a document where I describe some oft he errors.

The site is
Sovio-sovelius.com

The page is in the English part and on page “Priccens testsida” found on the menu on the right side.

Please, someone Help me!
Priccen