I never have to use my frozen stash technically because I pump two times for the next day (baby has two bottles while I'm away). Try to do that too. Pump as often as your baby would normally eat and then use those refrigerated bottles for the next day. Recently I decided to have my baby drink my old frozen stuff so I can refresh it with new milk so I sent along one frozen and one fresh (I froze the 2nd pumping session's worth) so now my freezer only has from February 15 and on.

Also, this lipase issue is NOT common. Because you read about it a lot online doesn't mean it's very popular To know for sure, you can taste your refrigerated milk after the amount of time you would normally give that bottle, say 24 hours later.