Prismaflex unit stops and displays error message during treatment: "malfunction: communication error".First occurrence happened a few weeks ago and delayed treatment for 5 hours.Second occurrence happened last week and instructions attached to machine were followed, but still extended treatment by several hours as the nurse had to cycle power several times.Hospital owns 8 prismaflex units.Half were upgraded to the required 7.20 sw version last year and now are having this issue.The field service engineer has started to install 7.21 on the units with 7.20.Manufacturer response for dialysis unit, prismaflex (per site reporter).Have made calls and sent emails.Manufacturer is aware but does not have a solution.Problem began after sw upgrades to 7.20 and now field service engineer is upgrading to 7.21.
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