electrics, alarms and hesitation

car (NA) has been suffering from hesitation lately so have been going through the big z checklist but one thing im wondering about and wanted to see if it makes sense before spending out

occasionally when i turn the key the car would light up as normal and then die before starting, kinda like if the battery was flat but moving the cables on the battery would kick it into life again, and it would start fine, my old battery was pretty old and the connectors didnt fit brilliantly and had a fair bit of play in them, i thought this was causing the miss-starts

i replaced the battery for a new better fitting one and cleaned the connectors a few weeks ago and the hesitation stopped completely and it thought it may have been that which was causing it - car was running great but the old problem with the ignition happened again on the weekend (the connectors are fitting perfectly now) the hesitation happened all through my journey home

im wondering if it could be a problem with the wiring or alarm

what else would cause it to die on ignition like that? and would it be causing the intermittent hesitation problem??

darren