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UMC cable question

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Is it ok to leave the UMC cable plugged in 24x7x365?
It does not seem to get hot when idle so I presume the electronics is not going to degrade.
Thanks.
I would imagine that frequent plugging and unplugging would lead to a loose connection at the plug / receptacle, which would lead to increased heat, which could then lead to something melting. I leave my UMC plugged in.
 
I leave mine plugged in. But note that some folks report that the NEMA 14-50 receptacle is not rated for lots of connect-disconnect cycles. Thus I purchased a 2nd UMC NEMA 14-50 adapter which I keep in the UMC tote bag. If I need to, I disconnect the UMC at the adapter (and do not disconnect the 14-50 adapter from the wall). Thus I do not overuse the receptacle, and am not worried about failure. Of course this is a bit of overkill since a new receptacle is about $10-15, but did not want to run into the overheating/meltdown scenario occasionally noted here. I suppsoe that the connection between the UMC and adapters can fail too, so who knows what is really better.