nitroengine

As an AM DXer, I'd suggest just applying just enough attenuation or building/buying a notch filter for 580 kHz. 5dB attenuation isn't bad. Many great KiwiSDRs have been fitted with AM BCB filters that wipe out the AM band entirely. Great if you're only interested in shortwave and the ham bands, but these Kiwis are very useful for content matching when trying to DX stations that are local/semi-local to the remote Kiwi.

I see you still have your AM channel spacing set to 9kHz, you can change that by going to the "Config" tab on your admin panel and setting "MW chan" to 10kHz.

I assume you've already done this, but I'll post it just in case. Double check that you don't have the GPS antenna and receive antennas swapped. A guy in town here who also has a Kiwi accidentally swapped those antennas and his Kiwi was acting in a similar way. With his antenna transformer (which almost appears as a short at DC) connected to the GPS antenna input, it was essentially shorting out the 3.3 volt DC bias on that jack. The Kiwi would power up, he could get into the admin page, but the waterfall was slow, had a bunch of spurs with no actual signals, and it would randomly freeze up.

After some remote troubleshooting (I wasn't there), we realized the antennas were swapped. After correcting that, it came back online like normal.

If they are not swapped, try powering it up without the GPS antenna attached, in the event there is a fault with the GPS antenna.

Looks like FSK. You could try playing around with the decoder in the Kiwi to see if you can get a decode.

Somewhere it was mentioned you want a MicroSDHC card of 8-32GB. John or someone can correct me if I'm wrong, but from my understanding, MicroSDXC cards are not supported on the Beagle.

I know some MicroSDXC cards do have backwards compatibility with MicroSDHC devices.

I know the majority of Kiwi owners are only interested in HF, but there are many of us who do a lot of MW DX. The network of public Kiwis are highly useful for trying to track down a weak MW station, especially one that doesn't have an online stream. Using my own Kiwi and comparing to another Kiwi, you can often hear the 1:1 echo of a station between the two SDRs. So its unfortunate to see once really good Kiwis in desirable areas suddenly go "deaf"...or so you think until you zoom the waterfall out and see VLF and HF are as alive as can be and it's only the AM band that is deaf 😖...

So instead of implementing an MW BCB filter, I'd encourage trying a few dB of attenuation or try constructing notch filters for those specific problem frequencies.

A couple more once good Kiwis, including one out in California I often used, just tossed MW filters on them within the past month or so.