I haven't seen anything that said why Soundsational was going to a weekends only schedule starting in April, but it might be a cost-cutting measure. There were reports/gossip earlier that both WDW and DLR would see a reduction in entertainment as a result of financial issues with Shanghai. So I could see where they might opt to cut performances of Soundsational during the "non-peak" season. It doesn't look like it's an issue with the parade route (like it appears to be for the Pixar Play Parade over in DCA during F&W) because PtN is still on the schedule. So at this point, I'd be inclined to say it's a cost-cutting measure.