I can't help with the waits you see in the logs but your printer switching off sounds like a power supply problem.
If you search through the forum you will find many instances of problems with the power supply supplied with the
kits. It appears to be underpowered in a lot of cases. Some have contacted Seemecnc about the problem, some
have upgraded to a supply capable of supplying more current. One popular supply is
http://www.amazon.com/SUPERNIGHT-Univer ... wer+supply
It supplies 30A at 12v but obviously is not shaped like the original supply but is reasonably inexpensive.
Warning! This supply requires you to supply an AC power cord that has exposed wires that connect to screws on the supply.
If you have no experience working with AC line voltage then please disregard this information,
AC line voltage can be deadly if
you are not experienced with working with it. I do feel your problem is power related, you take it from there and make the
decision on what to do. Welcome to the Forum by the way. Sometimes it takes awhile for someone to respond, but we will help you in any way we can.