Starter suddenly sluggish

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Hey guys,

I keep my starter in the refrigerator, I feed 100g of AP flour + 70g water to 20g of starter and stick in the fridge where it normally peaks in 3 or 4 days, it's what I've always done. However, as of a couple weeks ago, it's really sluggish. It's been in the refrigerator for over a week now and has yet to double, it's rising at a glacial pace. Any thoughts as to why this is?

Arch, your process is unusual. Most bakers ferment their refreshed starter on the counter for a while and then refrigerate. Since you’ve done this successfully before, I’m guessing your fridge is fairly warm. 

Try this. Place a glass of water in the fridge overnight. The next day measure the temp and reply to this post with your findings.

I'll do that tonight! my refrigerator is set to 2 on the temperature dial, 1 being the warmest and 5 the coldest so it's on the warmer side I suppose. I haven't changed the setting though :/

Arch,

I’m still new at this and I have some ups and downs with my starter too. What I do when it feels like my starter is sluggish I discard half and replace with a 50/50 flour mixes usual. Instead of waiting 24 hours for the next feeding I wait 12 hours and discard about 20% and replace it with a 50/50 mix. 12 hours later I get back on my 24 hour schedule. It seem that that extra small feeding really does the trick.

As far as refrigerating, I keep a back up starter in the fridge that I feed about once a week. Sometimes I simply feed it with excess leaven and a small amount of 50/50 flour and water. This helps maintain the original starter lineage with both my room temp one and my refrigerated one. 
Cheers