When does the loss slow or stall?

I'll be at 4 months tomorrow....but have been stuck at 276 for 3 weeks now. Up until then I was losing pretty fast and I guess I was getting used to it :/ but this stalling sucks! When did some of you guy**** a stall or really slowed or stopped?? I know I'm not done yet...lol

These are the rules I followed/follow: 

*3-6 Months After Surgery: I ate 600-700 calories a day

*6-9 Months After Surgery: I ate 800-900 calories a day

*9-12 Months After Surgery: I ate 1000 calories a day
*12-24 Months After Surgery: eat 1200 calories a day (I ate 1200 calories a day until 15 months when I reached my goal weight)

*24 Months after surgery (or when goal weight is reached before 24 months): Maintenance calories (BMR/RMR & Activity Level) (Malabsorption of calories lasts approximately 18-24 months) (I eat 1800-2000 calories a day to maintain my weight loss of 200 pounds at a weight of 131 pounds. My height is 5'4")

*I do not participate in a formal exercise program due to Rheumatoid Arthritis and Osteoarthritis. I do move around a lot more and do a lot more walking.
*I never experienced a stall (Please no haters!!!...LOL )

I hit a stall at about 8 weeks out. It lasted 3 almost 4 weeks. I stopped eating everything that wasn't protein, ate less but more often and did two shakes a day. The stall ended and I'm back to losing about a 1 lb a day.

I had my first stall at about 4 weeks out. Now I'm at another stall 4.5 months out. I've been at this weight for two weeks, even gained 3 pounds and now still at the same spot. I'm a bit worried but it looks like it is going down again.

Stalls can happen at ANY time. Other than the typical one at 2-3 weeks out, there is no typical time for a stall to happen. Weight loss generally slows at about 6 months out and slows down considerably (or, for some, stops or crawls) by a year out. Some people also notice a slowing at 9 months out as well.

Lora