Hello Diego, this error was mentioned few times earlier, its very problematic. this two things is mostly the reason -
first have observed few days back
1. Too big mesh - if in settings is enabled VBO ( im get it on mesh aprox 30-50 mil trias - when im over physical RAM of GPU ) - try disable any other sw when working with pscan - everything except pscan consume GPU ram. 1GB of physical RAM on GPU can hold aprox 45 Mil trias + texture size if is generated. try shitch from SHADED to SOLID in viewport of pscan......
2. Its something in HW of the GPU, im see it few times when monitoring GPU and card switch power states of the GPU. - in short
Best if get this error that you restart PC and run as mentioned just PSCAN, nothing else. If you get this error again - restart PC......
This error is a longtime known, NVIDIA do nothing with it over 3-4 years, ( have read that BIOS of GPU should be upgraded, but thats very problematic, because of lack of new BIOS files for specific card. Only few EVGA cards could be managed this way. )