A quick question for the studio lighting gurus. I am shooting products now and I am using Speedotron with 2 heads and an AB 400. Then I have a Ebay radio trigger. The Speedotron is very old and was on storage for many years prior to me using them. They have been working fine for the past 2 years till just recently. My problem is the heads would not fire consistently. Head 1 would fire at less than full power 1 in every 10-15 pops. Head 2 would do the same but at lesser frequency like around 1 in every 20-25 pops. The problem alternates from head to head. I give it plenty of time to recycle so thats not the issue. What is the problem? Is the power pack going bad? Thanks in Advance.