Let me see if I'm understanding what you're doing. You have an 8410 that is having the above problem, you plug it into a jack that is wired for an 8434 or an 8411 and the problem goes away? Is that correct?
First step I would take is to wire a jack directly off the wiring field from the switch to rule out a house cable problem.
If phone still has same problem the second step would be to change the phone type on one of the ports configured for an 8434 to an 8410 and plug in the problem phone. If still the same problem I'd plug the 8434 in and see if it does the same thing.
If both phones have same problem I'd look into the way my system configures the 8410, if only the 8410 has the problem I'd say I bought a bad lot of phones.
One thing to think about is if 140 represents all the 8410s plugged into the system you might just plug in an 8434 to a port configured for an 8410 and eliminate the first step and the first half of the second.