Most toilet including the American Standard Touchless usually makes a sound like guggles or bubbles to inform it has negative air pressure or suction. It builds up the air inside the drain line by making an airlock that prevents water to the toilet bowl. The gurgling noise also causes a bad release of water or clog-like issues due to air restriction in the drainpipe and toilet bowl. So if this is what happening, it could eb pretty serious and you should not wait for contacting an expert.