My Library keeps disappearing

I love the 21 day meditation series. I have purchased 4 of them but have been very disappointed in how often the App says I have no purchased content in my library? And I cant access my 4 series at all!
I travel internationally and love to have easy access to my downloaded purchased series but am always so frustrated when they "disappear ". Often wit app updates or just randomly .

Gray1223 about 21-Day Meditation Experience, v2.3.2