I don't have problems with RJ45 tabs breaking off. I do have two problems with the connectors:

1. Sometimes the connectors don't latch properly in the port and fall right out. I try to bend the tab out further to help it latch but it never stays.

2. Some patch cables have rubber over moulding that covers the latch that's so stiff that I have trouble getting it to release. Who even wants the latches to be covered? One of my cables has a thin rubber tab over the clip that stops it from snagging on things, I guess, but doesn't inhibit unlatching. But it seems that the most popular over moulding is the terrible one.