monitor awakens with bad resolution choices

I have a MacBook Air, running OS 10.9.5, connected to an LG monitor (LG IPS LED 24EC53). In normal operation (e.g., when first starting up) all is ok. However, if the Mac goes to sleep and then is reawakened sometimes the LG monitor comes up with really awful resolution choices (e.g., 800 x 600, with the top choice being 1400 x 1050). When things are right the resolution is 1920 x 1080.

I notice also that in Display settings the top of the window, when bad, reads "VGA Display" rather than presenting the name in the profile (as it displays when things are good): "24EC53"

When bad, when I click the "Color" tab I do see the Profile for the LG (when I force it to display all Profiles) but I cannot seem to cause it to apply/use that profile.

I took my question LG support and they turned the problem back at the computer/OS: "The description provided suggests that the computer is not recognizing the device when it tries to restart. The monitor has not changed in its operations, and does not have the capabilities of changing the resolution on its own, without the software that is in the computer."

My fix is to put the system back to sleep, wait a few minutes, then reawaken it (at which point it is generally ok). Sometimes, tho', I do need to do a full restart.

Any ideas?