I've just solved a similar problem with my 06 Civic diesel 2.2. The battery started to struggle to start the car, battery was a new Varta a year ago. Then the start button failed to respond 1 time in ten. Checked charge voltage, resting voltage etc all ok. Had horrible thoughts of expensive electrickery problems.
Decided to start by checking/cleaning all the battery connections, all ok until I tried to find the main block ground to chassis connection. Finally found it lurking under the battery tray and yes it was loose and corroded, cleaned it up and all sorted.
Not the first time I've had this sort of problem-my old 5 series BMW E34 had the same fault except the main battery ground is under the back seat.
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