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When the displays are working in clone mode then they are sharing the same resolutions, refresh rates, etc. Since you are not using the native resolution of the monitors then it is expected you will not get the best display quality in one of the monitors or both. If the displays are in either single display or extended mode then you can have the native resolution of each display.
With the second issue I believe that when you turn on the LG TV the computer detects a hardware change through the HDMI cable so that may be the reason why the computer is behaving that way.
I check again TV's and monitor specification. Seem that TV 37LD465 natively support display resolution 1080p and 60 Hz over HDMI and monitor Dell U2312HM also natively support 1080p, 60Hz. I set this resolutions and refresh rates manualy for each display (1080p, 60Hz).
I agree for second issue that is about hardware change detection, although this fashion is too anoying. Some info ballon in right corner is way better solution, imho.
Thank You very much!