In reply to DanielGyi:
Lots of injuries are caused by imbalances and deficiencies in other areas of the body, an example in your case as others have mentioned your hamstrings might be tight, or could it could be something to do with how your body puts pressure on your glutes if you cycle. I can't really tell you without looking at how you walk and do various movements.
It's worth taking on a full body stretch and strengthening routine to try and address these problems. An easy way of incorporating this into your daily life is 20-30 minute yoga sessions. Yoga is great because you'll usually find out pretty quickly how much stronger the dominant side of your body is, and it will work whole areas of your body that are under utilised. I follow this person's channel and try and do a session before work or straight after (feels good after being at a desk for so long.)
https://www.youtube.com/user/yogawithkassandra
I'm also concerned that you've said the injury has recurred over 12 months - it's definitely worth seeing a physiotherapist about it, lest you do something more serious/permanent.