Any ideas why my Land Rover Discovery doesn't start sometimes?

It does this unexpectedly maybe once a month, both when it hasn't been driven and when it has recently been driven. You can turn the key and the power works but nothing happens. Then if you wait like 5 minutes, it'll start. Any ideas how I can diagnose and fix this myself...Any ideas why my Land Rover Discovery doesn't start sometimes?
The discovery has a main ground cable problem that is quite simple to repair. The connection in question is on the right frame rail inside the wheel well, behind the body mount. Remove the cable from the frame and polish the end with sandpaper then reinstall. There are 3 other possibilities. Battery terminals, solenoid or the safety neutral switch. Disconnect and clean the battery terminals when you do the frame ground.If this doesn't do the trick, next time it happens, shift the trans. in neutral from park and try starting it. If it cranks, it's the switch. Another test is to connect a test light to the small wire on the starter solenoid and turn the key during a no-crank moment. If the tester lights up, it's the starter solenoid.Any ideas why my Land Rover Discovery doesn't start sometimes?
have a mechanic check the alternator belt it may need to be tightened.Any ideas why my Land Rover Discovery doesn't start sometimes?
There are a few things in the starting circuits of the Disco

Such as starter relay, ignition switch, if it is automatic then inhibitor switch, starter solenoid (built into starter motor) and lastly wireing connections.

Any of these could be at fault. If it is automatic try putting it in and out of park , this will move the inhibitor switch. If this works you will need to replace this switch.

The starter relay is not that expensive. It may be worth replacing this to see if it solves the problem.

My personal feeling is that the starter motor is starting to wear out and it may well be time for an overhaul or replacement. This could work out expensive so get it checked out before going down this route.

Sorry I have no definite answer for you.

Best of luck.
sounds like you got a bad connection some wheres.check the earth strap from chassis to engine.also check connections on igniton switch. another thing to look at is the battery terminals .remove them.clean the battery terminals with emery cloth.replace them to their correct positions and tighten them good.it could be a faulty starter relay.swap it out and try it.

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