Please activate the debug mode in Setup→General Settings→Other tab to see what functions are failing. Afterwards, it will be best if you open a ticket to our Support Team and provide the additional data logs in it - with these, our specialist will be able to help you and eliminate the issue promptly.
The cause of issue may vary in different environments, so it will be best if you follow the same suggestion as provided above. Once you open a ticket, we will help you eliminate the problem in the shortest possible timescale.