I was getting the 508 error a number of times the other evening whilst I was doing some reading (knowing is growing, I "learn" about stuff even though I don't need to know about it, anyway) and I found that going back and clicking on the same link didn't help, but using the refresh button instead seemed to stop the problem from showing up so much.
My assumption is that this problem only really occurs in the evening (or maybe early morning) when people are getting back from work and doing some reading or catching up on their threads here on busaustralia.com, and it seems there is no issue during the day.
So maybe a very slight capacity/resource limit increase would be the order of the day, rather than having to pay for a huge amount of connections we just aren't using (i.e. Scaling from 20 connections to 30, rather than 20 to 50), that, or maybe the rules have to be altered so that users are only uploading say 3 photos per post (at a smaller size too, perhaps, since I am used to the tiny sizes used by the vintage/modern appliance forum I am a member of), which would help keep the servers free. Imposing these rules might eliminate the need for any connection/service upgrades and would probably only be of minor inconvenience (what's worse, waiting for "your turn" to connect to the website or having to resize your photos more?)
Thats my 2 cents worth - its probably no help, but would at least help reduce any associated costs to do with the site.
Why doesn't like an old Transperth Bus OR Train?