Hi @ognqn.chikov, @ivar
As @sv650suk mentioned, we are aware of this issue stemming from a release we did on February 14th, and I do apologize as I know its a frustrating bug to deal with.
You can temporarily work around the issue by force-stopping and closing the Android app from the Android Application Manager, then tapping 'Clear Data'. You'll have to re-login when you launch Cayenne, but the error messages should cease.
We know at this point that closing the app (or having it closed by a battery manager or other utility apps) will trigger the bug to reoccur, so we're recommending that you just background the app until we have a new build released. However I have heard from people who insist that it still recurs even with no explicit closing of the app, so there may not be a foolproof way to avoid the error from reoccurring until we have a new Android build on the Play Store. You can always go through the process above to temporarily stop the error messages, of course.
I know that's not a great experience and we're working to get the new build out as soon as possible. We've already got it working in our QA environment, and passing all tests where the current one failed, so I have confidence that 'soon' will actually be soon with this one.
Thank you for your patience, and if you're reading this by all means post here if you're seeing this error if you want me to add you to the notification list when the fix is released.