Then it must be the switch. Contacts might have become dodgy over many years.
Once a month for 20 mins isn't that bad, unless of course that 20 minutes happen to be on a long dark stretch in the middle of the pitch black night with no street lights, while you're doing 100+km/h.
Find it and fix it. Don't take any chances that are not worth it. Get a replacement switch from a wrecker. Cheaper and that way you can confirm the problem without spending a fortune.




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