App changes randomly don't save, and new saves taking much longer than expected

Hi all, recently started running into trouble saving changes I make in my app. At first, all queries and new components started disappearing on refresh. I reverted the history a couple back, and that worked for a bit, but now it's stuck again. Seems I can only save one or two things in the app at a time - the history will appear to show that I've saved something "now", but when I publish the release half the work is wiped, and upon editing the app the history doesn't include recent changes.

On top of this, any saves that do happen are incredibly slow, for example editing and saving a query takes multiple minutes. Read through a lot of forum posts of people having issues saving, but haven't found a resolution for my issue yet.

Appreciate any help!