Problem started with Android app

So this is strange as it was working fine before. Today I noticed I could open the app see everything. I click to go into a folder. No thumbnail image. I click on refresh and it takes me to the Nextcloud screen saying enter password again then forwards strait to my server page to login again. I login. authorize the device and it shows me main section again. I click on folder. Back to blue screen and to login again. It seems to be in a loop doing this and not sure why.