Over 2.5 years ago I took my car to Lotus to fix right side fast flashing issue. The car was under warrantee then.
1st time they replaced the harness - took them 5 days and issue came back within days. 2nd time they replaced the rear LED light - took them 14 days and issue came back within a day. 3rd time they replaced the harness again and moved the left light to the right - took them another 7 days and did not fix anything.
I just gave up and realistically never used the indicator since I am mostly on the track.