When there's occur delaying phase, i suggest that you should leave that bounty. Because of you will lost your time just to wait for the bounty to resume. It is not the matter of the reward though, but kinda wasting your time that supposed could bring you more profit from the other bounties.
But here it is still necessary to understand why extend the project. To collect the required amount or to collect even more. If more, then the rewards will increase.