Printer type, model, etc?? We are working in the dark here.
Not all printers are created equal; some are high quality, some are junk.
It works well for a week. But now it is working slowly and jams every 1 or 2 hours of work
I assume you mean that you can print with this paper you linked to for 2 hours and then the printer fails to load the paper. Then the next day you can print for another 2 hours before the printer fails again. And so on. At least that is what you posted as I see it.
Possible two reasons: you are obviously using this printer for heavy work, possibly in an office or home-business dealing with photographs. These printers that are for homes are not intended for heavy production work, such as photo-booths at parties, etc. They will fail if used this way.
Another possibility is that the printer is over-heating and shuts down; that is why you can use it again the next day for a couple of hours until it quits again. Eventually it will burn out the motor or damage a circuit board.
Another possibility is that the pickup rollers are becoming worn or glazed with use; my Canon Pixma ip7220 has a roller cleaning option command in the utility screen that cleans the rollers if they start to slip, you might check your user's manual for that. I had to use that a couple of times when the photo paper started slipping and not loading.
With the limited information, that's about all I can suggest.