You could be overwatering them - S.oreophila likes it a lot drier
than most other Sarras. It sounds to me that it's happy with the
reduced dormancy water level, but finds it hard to cope when you
raise the level in the summer.
I have mine in tall pots standing in 1" of water which I allow to
dry out for a day or two before refilling. All my other Sarras are
in 2-3" permanently.
Happy growing,
Peter
snail:Peter Cole,17 Wimmerfield Cr. :mailto:carnivor@bunyip.demon.co.uk
Killay, SWANSEA SA2 7BU, WALES :http://www.angel.co.uk/flytrap/index.htm
vox:+44 1792 205214 :ftp://www.angel.co.uk/pub/flytrap