Ah!, this is mostly because of internet slowness. Please let us know if this is the same issue you are facing on other apps as well, or it is only on Josh. If yes, or you are not convinced, please send us the following details and we will help you at the earliest:
Error screenshot or a video of the issue and Share your Client ID (Open Myjosh >> Tab on three dashes >> Click on settings About us) with us at firstname.lastname@example.org.
We'll be more than happy to assist you. Thank you!