You report that the GPS "crashes" after 4 or five hours. By crashing, I suppose you mean that the GPS position is lost
, the boat icon goes grey.
Does this happen repeatably on an otherwise quiet system? Or are you underway, and exercising the machine in other ways in addition to OCPN?
Have you upgraded the GPS drivers recently? Prolific drivers come in a lots of flavors....
Any possibility of mechanical instability? I have found that USB ports
deteriorate over time, such that any slight mechanical shock or jolt will cause a temporary dropout.
Any other circumstances to note?
I note that this is not a common problem, in fact not ever reported in exactly these terms. So this suggests that there is something "unusual" going on with your environment