we have often discussed this being a problem with intermittents on the main board with a number of symptoms
BEFORE YOU CONDEMN THE MAIN BOARD, go to device manager on the pc, go to your network interface (ethernet or wireless) [i have always said, NEVER PRINT with a wireless connection, but that is a different story]
go to properties on your network card choose the power management tab and be sure EVERYTHING IS UNCHECKED. no more allow the computer to turn off this device to save power. also search "edit power plan" and be sure
put computer to sleep or hibernation is set VERY LONG (i prefer never).
THE OPERATING SYSTEMS ARE NOT SMART ENOUGH TO SEE RESOURCES ARE IN USE.
if this is not the case, find a GOOD LAPTOP REFURBISHER who has a "re-flow or rework oven" who can take your system board and explain your problem.
tell me roland has a reputation for thermal intermittent problems and he will carefully heat the board, to reflow solder connections
an experienced company can do this properly (it had to be done to MILLIONS of laptop mother bioards with NVIDIA chips 10-15 years ago
in a recent thread by adam edge we discuss this (we beat a dead horse actually, i hope adam's problem has been successfully resolved) issue with roland boards going intermittent
ONE ADDITIONAL THOUGHT. you may want to add a fan or two, allowing airflow above & below (if practical) the system board
as the system board heats up, it twists and flexes (the trigger event for your problem, most likely) to be sure, there is no down side to adding fans