Help! Crappy pump causing lower output

My hospital-grade pump stopped working and gave me an error message. I was getting 3.5-4oz per session yesterday with the hospital-grade pump. When I had to switch yo my double electric overnight, I was only able to get 2oz!! 😩 I'm super frustrated and am now dreading going back to work even more b/c I definitely won't have the hospital-grade pump at work... What can I do to get more milk out of these stupid double electric pumps?! I have both the Ameda Purely Yours and the Medela Advanced Personal Double Electric... Any advice??