Hello McRoue and welcome to the forums.
Unfortunately it is one of the correct processes. You will need to reapply for PIP, by ringing them up and requesting a form etc as though you were a new claimant.
If there are exceptional circumstances why a break in your payments will cause damage to your health I would include a letter to this affect in with your application, asking if it is possible expedite your application.
If you get your new application process started before the current award finishes your new award should be backdated to the end of your current one.
Remember to read our guides and gather all the supporting letters you can!
www.benefitsandwork.co.uk/help-for-claimants Catherine