Does anyone have any experiance with intermittent connections using Deans Ultra connectors?

I have three planes each set up with their own ESC's using Dean's connectors, and each has their own battery.

Recently, all three exhibited power cut-out issues. (The set-ups are about three years old, although one plane has hardly been used).

The first time this happened I thought that the connection at the battery end (manufacturer's connection) had let go because the Deans end appeared fine and I got a "no battery" error message on my charger.

However, if I connect the Li-Po's to a Watt meter (no load) and apply a very gentlle pressure in a "break" direction at the Dean's connection,

Upon further inspection the cell end of the wire connections were found to be good.

The watt meter goes blank untill I release the pressure. This can be duplicated 100% of the time on these three batteries connected to the watt meter or the ESC's.

Pressure exerted in any direction at the solder joints does not cause this apparent connection loss.

The connecting tabs are clean (tried "scotch brite") and the "spring leafs" are intact on all the male connectors..

Note: Two other batteries with the same connections, zero failure with the same test(?) proceedure using the same male connector on the watt meter.

Anyone experiance anything like this; or have any ideas?

Al