Mg zr ignition problems

Had the Zr for a month or so, ands it's developed an ignition issue.

9/10 it's absolutely fine, but occassionally, turn the key and : nothing, leave it 10 minutes, it's fine.

Had an issue last week, tried for a few minutes, it tried to start, and you could tell the battery was getting weaker and weaker, left it golf hour, started immediately.

Where to start?

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