Here are some troubleshooting steps that may resolve your problem without replacing parts in the refrigerator:
If you have not replaced the filter cartridge within the last 9 months or your filter status light indicates the filter needs replacement, then I recommend changing the water filter cartridge. This may be restricting your water flow.
I also recommend checking the water pressure from the line that connects to the back of your refrigerator. Try cycling the water supply valve shut and then back open. Sometimes debris can clog this water valve. Cycling it will sometimes eliminate a restriction in the valve. See if water pressure improves through the water dispenser. If not, then I recommend turning the valve back off and disconnecting the water line from the fitting on the back of the refrigerator. Place the end of the water line in a bucket or container. Briefly turn the water valve back on to check the water flow from the supply line. If it is weak, then you will need to get a plumber to fix your water pressure problem in the supply line to the refrigerator.
Check your refrigerator temperature. If it is set too cold, it can freeze the coiled up water line reservoir at the back of the refrigerator. This would restrict water flow through the dispenser.
If the above troubleshooting does not help, then you could have a problem with the valve assembly. The first image below shows a diagram of the water system for your refrigerator. The second image shows the location of the water valve assembly. Be sure to unplug the refrigerator before accessing internal components. You can check for loose wiring connections on the valves.
Technical diagnosis of water valve operation typically requires live voltage checks on this refrigerator. I do not recommend conducting these live voltage checks yourself. I recommend calling a service technician to diagnose and repair the dispenser valve assembly if you suspect that your problem is in this area.
If the above the troubleshooting and information does not help you resolve this problem, resubmit your question with additional details for more technical assistance.