Something off mid feeding cycle of starter
I've had my current starter for around 2 years and until recently it has performed perfectly, being used almost every day.
Around a month ago I began to notice a sulphuric smell mid feeding cycle. There is absolutely no smell upon feeding, then after around 6-8 hours the sulphur begins, but dies off as the starter grows in strength and acidity, so that it has completely gone 24 hours after feeding.
At first I thought it may be because I had changed flour suppliers, so I reverted to my old miller but no change. I even tried keeping a batch in a different location but to no avail.
I'm currently mixing 50/50 stoneground strong white and stoneground wholewheat, 100% hydration and 10% old leaven. I've also tried feeding more/less regularly but nothing seems to effect it.
Any advice would be appreciated, I'm not sure if anyone else has experienced this as the other similar posts I've read all seem to have a sulphur smell that stays permanently!