OPC Tag's Quality

Hi, I’m trying to use Programmable Device Simulator with a OPC UA Connection in my project loading a .csv file (using realistic function). When I did the connections the first day, components in Designer Launcher work, but a few days later when I open the project, didn’t work. It marks Uncertain_LastKnownValue and the tag’s value don’t change. Maybe it is happens because the first day I used a different provider internet? How I can solve this? Thanks.