The Deep Space Network shows that it's transmitting to Vikram, and two antennas are task with listening to it, but it's not receiving a signal. That's not good.

https://eyes.nasa.gov/dsn/dsn.html

it appears to have stopped listening now

I've been watching for a few minutes. It appeared to do a weird roll during braking, and then the line of descent greatly varied from the anticipated line. The room was jubilant prior to this, and now very somber.

Hopefully there will be good news. But I think it crashed.

That's the problem with simply losing communication. It's not positive evidence of a crash, it's just a lack of information. Possibly the landing jostled antennas or power relays causing a communications glitch... but you can't rule out that it just crashed :(

They're all just staring at their screens, just waiting for their craft to come back and say something. :(

Has a loss of communication with an unmanned probe on landing ever been resolved?

It happened before landing, so while the probe may have crashed, a crash did not cause the communications loss. Here are the most similar conditions I could find that recovered: Beresheet regained communications before landing but not in time to save the mission. Rosetta's Philae lander ended up in a bad spot and couldn't communicate much because of low solar power. Hayabusa had comms trouble when it was supposed to launch from its asteroid, but recovered.

Could it be possible that all the dust being kicked up in the "air" during landing could act as some sort of chaff that blocks radio signals?

Unlikely. In the absence of air dust particles are ballistic and cannot form a cloud.

Buddy in the video explained that the reason there are 5 in use instead of just 4 for landing was to keep the dust clouds from obscuring the camera footage.

Yes, a stream of high-speed particles flying away from landing site can obscure the ground. It is unlikely that such a stream will be deflected by some rocks to obscure antennas.