bad gateway 502 from Orderbook on UmbrelHome

Hi,
I have an Umbrel Home with UmbrelOS 1.4.2.
I have always used Bitcoin Core and Jam and everything has always worked regularly. The installed version of Jam is: v0.4.0.
For a few weeks now, it is no longer possible, by starting Jam, to access the order book, receiving the Bad Gateway 502 message.
I restarted Umbrel, I restarted Jam, and I uninstalled and reinstalled Jam. The problem persists. Obviously, the "ear" function also does not allow you to view the order book. I can also attach the log file, where everything seems to work. In addition to the technical fact of not being able to view the order book data, and therefore please tell me what the solution is, I am interested in knowing if the joinmarket function can still work or if, in addition to an informational problem, there is also an operational problem with joinmarket. Thank you.

Reproduce the 502 error on UmbrelOS 1.4.2 with Jam v0.4.0, focusing on the Orderbook and “ear” views. Start by reviewing the Jam logs mentioned in the report and verify whether JoinMarket operations still work; done means identifying the cause and confirming both orderbook access and operational status.

Written by the indexing model from the issue text.