I would simply reformat the HDD... that fixes many bugs on these machines for me. You may also have an SSD issue as well, because there's been quite a few failures of those things as well, across the smaller KM line...
OC
once firmware has been update we usually find its due to the types of files that the customer are printing. To test we turn machine off disconnect network cable and turn machine back on. the code usually disappears. We then reconnect network cable and usually if the job is still in the que the fault comes back. Some of the clients are expecting these little machines to perform like the bigger machine. Wanting champagne at beer prices.
I hope you don't get frozen copiers from installing the expansion memory. I had to remove the expansion memory of multiple c3350s, c3351s, c3851fs models due to frozen copiers, after Konica recommended replacing expansion memory, HDD,MFPB and the issue was not resolved we ended up taking off the extra memory and no callbacks since. We are lucky none of our customers use or even know anything about i-option.
Have 2 C3350 had same problem,it fixed after replaced SSD
Get back to network speed or change from Auto to 100 full or half duplex.
I have a C3350 that sometimes says "Service Call!" on the screen but no error code. I just formattet HDD, set network to 100 full duplex and ordered SSD. Will update when I know results.
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