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I do not think that your issue is with the card. If the antenna connections are corroded, that would mean that the card edge connectors may also be corroded.There should be no Blacklist for if you want to change the card to the Wireless-ac version of the 7260. CDW has them for around $30.
Are the issues not as pprevalent, with the AC version?
The biggest factor you are dealing with, is distance & power for device vs. Access Point. Also include construction of the building you are in, and building material type between device & Access Point.
I mainly use my laptop in the same room as our A/P. My son would get drops when he would be downstairs, because the foil antennas are not best when you have wood or even concrete in the way. We get 300mbps all of the time. If I go back to my son's room or downstairs, I may see 150-240mbps, but still get full Internet speed.
The A/P & card go into an energy saving state, when not needing full power to transfer small amounts of data.