I got a Shruthi XT few years back (bought it from someone) and always encountered the same problem with it.
Screen always shows values which changing really fast without affecting the sound. Values showed are the LFO parameters mainly. It’s going crazy once I’m touching the LFO part directly on the hardware. Otherwise it just randomly appears from time to time but it’s kind of annoying when I want to program the synth
When I switch to 4 knobs mode, it acts normally without any issues even if I gently push the LFO section on the hardware. I tend to use it in this configuration, but what a waste…
Any help is appreciated before I open it as I’m not too good at soldering.