Sorry you are having problems! Dr Tims is great stuff if it has been stored correctly. It is an active bacteria product so if it is exposed to extreme heat or cold it will not perform well. It also has a shelf life of 1 year although 6 months or less is recommended.
Stability is bacteria in a cyst form so it tends to start a little slower, but it is also more reliable since it can be frozen and exposed to up to 130F with no issues. Good luck!
FYI, I think you motivated me to go with a new SCA system