App Store app waiting for review for over six weeks

Our app was waiting for review for about a month. I then canceled the submission and resubmitted it, hoping this would place it back in the review queue.

It has now been more than two weeks since we resubmitted it, and the status is still showing as “Waiting for review.” In total, we have been waiting for more than six weeks without the review starting.

Is this normal? Is there anything we should do to follow up or check whether there is an issue with our submission?