I've read some other posts with people reporting this same thing, so I've decided to make another report of this.
Started a 3 player stroke play game on the front 9 of Kiawah. Had zero issues all the way through to the 8th hole. On the green at the 8th I was setting up my first putt and went to take my shot. Completed the swing but it hung and didn't hit the ball. Waiting for approximately 15-20 seconds and then it gave me the "an error has occured, please restart" message that we are all to familiar with. I closed the client window, restarted it, and then told me I did not return in time to finish the game. By this time a total of maybe 30-40 seconds had passed since I had completed my swing with it not actually hitting the ball.
Of course it's upsetting to have almost a full round wear on my ball, all for nothing.
I'd like to point out that I very rarely have issues playing on WGT.
I play WGT using Chrome.