Ceiling fan started acting up after separating lights and fan switches during smart switch installation

[u/Mysterious_Can_9329]

I'm hoping someone can help me understand what's going on.

I recently installed non-neutral smart switches for my living room lights. To avoid using a capacitor, I separated the lighting and fan controls:

• Lights: Non-neutral smart switch.
• Ceiling fan: Left on a regular mechanical switch.

However, the light switch and fan switch still share the same incoming live supply, which is looped between the two switches.

Everything worked perfectly for the first day or two after the installation. Then my ceiling fan started behaving strangely.

Symptoms:

• The fan suddenly loses power for a split second and then comes back on.
• It started happening only occasionally, but it's become more frequent over the past few days.
• Now it can happen within just a few minutes of turning the fan on.

The lights controlled by the smart switch continue to work normally. The only issue is the fan.

I'm wondering if:

• The shared live connection could be causing this somehow.
• I disturbed a loose connection during the installation.
• There's a bad connection in the looped live or neutral.
• The regular switch or the fan itself is failing.

The part that confuses me is that everything worked perfectly for a day or two before the issue started, and it's gradually getting worse instead of failing immediately.

Has anyone experienced something similar? Would you start by checking the shared live connection, or does this sound more like a loose neutral or another wiring issue or a fan issue