It could be around the high load causing errors that are causing unexpected flow on effects. For example, an earlier thread talked about how you're locked to a

It could be around the high load causing errors that are causing unexpected flow on effects. For example, an earlier thread talked about how you're locked to a specific server in the pool and if your server goes down, you can't continue because no other server in the pool will talk to you until the lock expires. Having said that I'm getting around 4 different errors randomly so it could be a number of things playing out in undefined ways.