Check Neo Store. It is an alternative front end to F-droid and has been way less buggy for me. Though to be fair just yesterday it ate up 20% of my battery life due to not being able to sync a repo (I think), but that hasn't happened before.
I use Droid-ify myself. It looks like Neo Store is a fork of it. Although neither has been updated for a number of months, Droid-ify's latest version is most recent.