Woh never get this bug yet ...
I can't imagine the time you gave to get to 800K aUEC
With your freelancer, you may try the "remove the claim jumper" mission : you get 10K aUEC for each mission, it take 10 to 15mn to complete and you can stack 3 or 4 of them (you always get 2 in the same location).
This is a combat mission, but the freelancer get very good weapons and it can do the job
You can also try the "personal" delivery mission for illicit stuf ... a guy showed in a video that they were 15K aUEC worth at port Olissar : take 2 of them going to the same destination and you will grind a little bit more efficiently ... in addition, even if you get caught by police, the fine is around 10K aUEC ... so you would be able to refund your fine with only 1 box
A little trick I used when performing trade run is to disconnect every hour : and to disconnect only near the outpost where I will buy stuff next time : so when I log in, I check on the chat if the server is alive and then I need only 10mn to buy the stuff and get to nearest spaceport : the probability to get a 30k error in only 10mn is quite low