Fixing power supply interference issue (?)
Try adding decoupling capacitors.

Decoupling capacitors are like sugar and your primary power supply is like fat. The first is fast and on-demand, the second is high energy but slow. If you try to do strenuous activity and your blood sugar is low, you pass out. Same thing with circuits, more or less.

All connections have inductance so sudden changes in current demand produce transient voltage drops or spikes across the trace inductance leading to the IC which can cause glitches and other issues.

Rule of thumb is to place a 100nF ceramic capacitor in parallel with the power pins of every IC as close as possible to the IC. You want a tiny store of reserve charge with minimal inductance to the IC to smooth over these transient current demands. This slows down the current change through the trace inductance as the main supply reacts as therefore reduces these voltage spikes and drops.

More capacitance is not always better. Well, in theory it is, but real capacitors have parasitic inductance too and larger capacitors tend to have more inductance which can defeat the purpose of smoothing high frequency transient currents. The large caps will smooth lower frequency transient currents better though.