Connectivity Issues with 1400 Wireless Bridge

Just seeing if anyone has run into a similar problem....I have two 1400 outdoor wireless bridges. They have been in place for a couple of years without issue. This past week, the non-root bridge began dropping it's association, at first randomly, then consistently. Both bridges have been replaced, antennas (AIR-ANT58G10SSA-N) on both have been replaced, and a spectrum analyzer has been used to verify there is not a problem over the air...the ditance between the two is >=1000 feet. Debugs show no reason for the drop, and when the two are asscoaited, the RSSI is averaging around -78. It had been down since Thursday, then last night, as another step in the process of elimination, we replaced the power injector on the root side, and the two bridges associated. They were up for two hours, then went down again, and then started going up and down randomly. As an additional step in the process of elimnation, we are now going to move the power source that the PI is connected to. Anyone ever run into something similar before or have any additional ideas? Thanks in advance.
Below is the most information I can glean from the logs
*Mar 1 06:31:39 pst: %DOT11-4-UPLINK_ESTABLISHED: Interface Dot11Radio0, Associated To AP KAirBridge_Para 0019.566e.be47 [None WPA PSK]
*Mar 1 06:31:39 pst: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up
*Mar 1 06:31:41 pst: %DOT11-4-UPLINK_DOWN: Interface Dot11Radio0, parent lost: Received deauthenticate (2) not valid
*Mar 1 06:31:41 pst: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down
*Mar 1 06:31:42 pst: %DOT11-4-UPLINK_ESTABLISHED: Interface Dot11Radio0, Associated To AP KAirBridge_Para 0019.566e.be47 [None WPA PSK]
*Mar 1 06:31:42 pst: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up
*Mar 1 06:32:05 pst: %DOT11-4-UPLINK_DOWN: Interface Dot11Radio0, parent lost: Received deauthenticate (2) not valid
*Mar 1 06:32:05 pst: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down

Yeah, power save is off, the cable run is only about 20 feet. The radio interface was shut down last night so that alerts weren't generated through the night due to flapping, I opened the interface earlier and right now both are up and have been for about an hour. I agree, -78 is not a great signal...currently, looking at the association, the root is at -64 and the non-root is at -62...will update if there is a status change. Thanks.

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