Buyer's lender delaying closing twice!

[Calvin Ly]

This is getting super frustrating and getting expensive. I just sold a home and another is under contraction to sell. Both times the lenders are pushing well beyond the closing date. First one was suppose to close in June 12th. Instead, the lender (Wells Fargo) asked for two extensions and we finally closed on June 27th. The second deal (lender is Quicken Loans) was suppose to close on the June 30th, then today July 7th, and now its suppose to be July 18th. This is super frustrating because it happened twice on two separate deals. What are my options? Do I have any? How can I prevent this in the future? My realtor is telling he is noticing this quite a bit lately. Is anyone else experiencing this as of late?

Oh when I said the lender asked for an extension, I meant more like dictated the date/s.