I could not eliminate the cause of the error message.
When the number of stations in the band is low, the message does not appear. The RPi 4B has 4GB of memory and htop shows that almost all 4 cores work at 100% during decoding, but there is no additional memory usage beyond 318MB. There is only a significant change in the use of the cores. When there are many stations in the band, the decoding naturally takes longer (in my case it happened for 5 seconds), so I set the AUTOSEQ setting to 'Call based on end of decoding'.
The various forum discussions and websites with this topic always talk about the separate PC and separate radio, where they try to eliminate the presence of rfi.
In our case, this is difficult to check because everything is built into one.
If you live in a less densely populated area and use the radio, you will probably not experience this error message.
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Gyula HA3HZ
HA3HZ