I have the same issue, but i uninstalled hakchi completely and flashed original kernel with 2.21e, after i downloaded 2.21b (without USLEEP issue) and installed custom kernel. After that i returned on 2.21e and then i only synchronized games, all OK! But i have a doubt: in the changelog of 2.21e there is "Scripts autoupdate, so you don't need to reflash custrom kernel after every update". What does it means? It means that when i synchronized games with 2.21e i bring back USLEEP issue? This issue it's not related to custom kernel?