Yes. With similar usage pattern...
Monday: Was in a rush, started charging the phone at 3am in the morning with 2A and went to bed. Woke up at 6am and unplugged it, left home at 7am and started using it since.
Tuesday: Charged the phone overnight from 12mn with my Galaxy W 0.7A charger and went to bed, unplugged it at 6am and started using at 7am.
Today: Charged the phone overnight from 2 am with my 2A charger (but I unticked both 'ignore margin' and 'unstable power' for today) and GCC shows me a reading of 1.2A.
So, Monday's battery life was so terrible. It lasted up until 4pm with 2h30m of SOT, 5% battery then I decided to swap my data SIM card to my cracked Note 2. Tuesday, similar usage but half the call time; SOT almost reaching 5h with 20% remaining. Today, lecture day, didn't use my phone much, I did 2h13m SOT with 63% battery remaining or about 36 mins / 10%
*I charge with my phone in airplane mode
*I use my phone in blocks of about 10-15 minutes
*Frequent replies to Whatsapp/SMS
*DATA/3G is on all the time
*screen is set to about 20% brightness/100% outdoors
*battery temperature averages at 35'c during usage
Wanamlite v1.3|Perseus 36.3|1.2GHz, undervolted to borderline stability, min GPU @ 54MHz|Power saving = off
worth investigating a bit, but I think your Monday usage of 2h SOT may mean some bad wakelocks?
My usage has never exceeded 4.5hrs SOT even when I was charging with the Nokia CA-101 which can only carry 1.1A, and on a bad day I get about 3hrs SOT. I have the BBS widget on my homescreen which shows Wakelocks live, so when the Wakelocks bar gets long, I check, and sometime a reboot solves it.