In case of single machines, please check CPU specifications. If you have Dual Core, Core2Duo, Celeron Processors, there are possibilities of era explorer getting hanged while submitting DIY.
Solution for this is, you have to upgrade CPU to I3 processors OR you have to close all CPU consuming processes like (Tomcat, Mysql etc)
In case of Extenda machines, server specification should be I3 processor minimum with 4 GB Ram. Do not start or submit more than 3 DIYs at one time or this issue may occur.