Disappearing tabs on my ipad

Why do all my open tabs {maybe 30} disappear all at once. Had this happen a few months ago and then one day they were all back. Now a couple days ago same thing, all gone. Is this a bug or something I’m doing?

Issue from 1 year ago - any chance that your issue is very similar to:

Hello, were you able to figure this out? I just lost all of my tabs and desperately need them back.