What is the problem?
When server offline happened, sometimes the print job continued until the end but sometimes it stopped. Why?
What did you already try to solve it?
Asked Prusa Support the size of the memory in their i3MK3S printers but they said that there is no memory.
Going to need logs, and more than likely serial logs (will have to be enabled in settings) to debug this. There are two different situations that I think you are running into though. Either the network is dropping out, in which case the printer continues, or the printer connection is dropping out in which case the print stops.