EON condo issue

   I have been working on a portable EON RO for months due to intermittent high condo or low percent reject. I have ran it for hours and never duplicated it but staff send me pictures of the screen when it does it. I have looked for loose connections, replaced product condo sensor, conductivity board and reinitialized the software on PLC. The pics they send me show the condo right at 250uS or condo is fine but percent reject is exactly 90%. When I run it, the condo stays at 8uS and percent reject around 97%. I have been working on this as it is an electronics problem but now im wondering if there is some where feed and product water could mix and cause this issue. Generally they have to run it 3 hours or more before it does it. If feed water got into product water it obviously would cause high condo and if product water got into feed it would cause very low feed condo which would kill percent reject formula. Any ideas are appreciated. Thanks.  

Already tried hugging RO that didnt work.