Either taking too much time to check the code or sometimes it never gets checked even after many attempts

When I am trying to check my code in the workshop, it is either checking very late or not checking at all , this is happening just recently ,it was perfect before, I have checked internet connection and every other factors whether they are the cause for this trouble ,but that is not the case,So I thought of writing to you regarding the issue.

Help me to resolve this issue , so I can complete my modules without any problems
ThankYou.

can you give some examples of where this is happening?