I just had an issue where I withdrew all of my money to buy a car in Project Ventura right? And the other dealership wouldn't let me buy a car, so I started walking to Kai's. There was a server restart while walking, and it told me to rejoin. Everyone had left the server, and the map wasn't loading in probably cause of the restart. it said "All Data Has Been Saved". With no other choice, I rejoined. Once I rejoined all of my money is gone, and I had lost $10k in 5 seconds for something that I was told to do. 

I understand that when you leave, it wipes your wallet. But It's not like I just left and forgot, It was a server restart which was shutting down and restarting the server, I had no other choice.

what should I do?

Hello, unfortunately, there is nothing that can be done in a situation like this. It is unfortunate that you had to encounter an server restart, however, server restarts are usually announced in the server - 5 minutes in advance, giving you enough time to make an decision on what to do with your money. I agree with you, that it can be tiresome and to some - an pointless integration, but this was integrated as a solution to the ongoing issue with people farming money.