I seem to be having a problem with my replacement A/C adapter that I had replaced for warranty. My controller keeps shutting off and on on its own. The round plug-in piece just seems to be slightly smaller than the original one, so seems to be making a poor contact. The replacement unit is totally different than the original, even the power pack is different - but same electrical specs. When received it was in a little profilux box. Just wondering if anyone has come across this or a resolution. The store I bought it at has the owner on vacation for awhile and now I'm headed for the hospital for awhile so this makes things alot more difficult for my tank sitter.