The reply is indeed empty, when calling /jl. I couldn’t find a cause for it in the firmware, other than it may be some sort of overflow, when writing to or reading from the SD card. The odd part is a power off reset causes it to respond properly. As stated before it was only happening on data from the 4th days worth of logs. If no log is written for a couple days in the middle it still has the issue on the 4th day of logs when they are written. For example:
Hopefully you can nail down a cause, because I’m truly stumped by this one.