One of the cons of my tslim insulin pump

 

Day not even four for this cartridge.  :-( The insulin has decided it wanted to go bad this morning.  I was like what in the WORLD is going on, I kept correcting and no results. Yep I feel like garbage with a headache.  I guess after being outside most of the weekend and one really warm and humid afternoon/evening on Saturday, I just cooked my insulin.  This NEVER happened with my Medtronic pump.  In fact I could use insulin in the same cartridge for over 7 days.  With the tslim, in my experience, my insulin will not go past four days.  I am on Humalog but I wonder if switching to Novolog would help me stretch it out more.  With this pump I am almost never changing my site and insulin at the same time.  Has anyone out there had good luck with Novolog in a tslim going past 4 days?