There could be even more pain ahead for Supermicro shareholders.Management at Super Micro Computer (SMCI -12.01%) gave investors a much-anticipated business update last week that did not appease investor concerns. And the company faces yet another major hurdle this week.Concerns about an upcoming deadline as well as fears of lost business opportunities have the stock sliding today. As of 10:40 a.m. ET, Supermicro shares were starting off the week down by 11.1%. That brings the monthly drop in the stock to a ...