Troubleshooting RO Filter

Last fall we struggled with our water pole setup on a big job. The problem was that we were unable to get enough water pressure to use the water pole. We were using a 5 stage filtration system a fiber filter, 2 carbon filters, and finally 2 reverse osmosis filters. Since the air temperature was hovering in th 50's, we chalked this problem up to the membranes becoming restricted due to the cooler temperature. We cut back drastically on the waste valve to increase pressure managed to complete the job in "limp" mode. We thus concluded that was it for that filter until warmer weather. We now get into spring and the temperatures have climbed. We return to same job and even though the air is temping in the 70's we again experience the same pressure issue. We once again reverted to "limp" mode and complete the job. After making a phone call to our manufacturer "simpole", Phil after hearing the symptoms concluded that somehow our RO filters must be clogged. The solution would be to dismantle the whole filter system and soak the RO membrane in DI water overnight and reassemble. This makes lot's of sense and we are going to implement this shortly. Have you had any such issues with your filtration systems? By the way we had 40 pounds of pressure going in to the system, but only getting about 20 pounds out. Let us know what you've experienced.