Hi,
First year of making milk kefir and during warm months, it was fine. Cold started I cannot make milk kefir any more. Tried leaving them for up to 5 days. Bought a new batch of grains thinking mine are somehow gone spoilt. Still the same thing happens. Cheesie layer (2-3cm) forms on the top of the jar & the rest underneath remains milk which runs through the sieve as milk does and there is no nice thick kefir consistency. Most forums advise milk kefir ferments in winter too, just more slowly. Mine stopped fermenting all together and new batch of grains did not solve this puzzle either. I live in Adelaide (winter temperature average 3-4 degrees C minimum,15-17 degrees C maximum). Has anybody experienced something like this too?