Skydrive does not remain logged-in and therefore does not synch properly. Getting started pop-ups all them time despite it being installed.

I have had Skydrive for several month working fine. I am saving all documents to the skydrive folder to have a full cloud backup and accessibility from anywhere. It has worked perfectly, with Skydrive automatically synching everything any time I am starting/online with my computer. I have never had to manually log into Skypdrive for every session. 

For a few weeks now skydrive is not logging in automatically and asking me for my credentials at the start of a session. What is worse, it is giving me the 'Start working with Skydrive' (or similar, do not remember the exact wording) pop-up as if I had not installed Skydrive locally yet. I have to click through the routine with skydrive noticing that there is already a skydrive folder. Lastly, skydrive will then log out at some point in my session and these popp-ups return all the time while my backup is not working properly. 

I have ignored the issue for a while until my lenovo's motherboard blew and I was stranded for days without access to my data. Not ideal. 

Please advise what to do, thank you

Matthias