It may not be a pressure issue, esp if it's been raining or very humid where you live (and it is the tropics). Pressure switches are prone to arcing in damp conditions which will cause the switch to throw even when a signal hasn't been sent to it. The dampness causes the switch to arc and trigger the connection and eventually the metal contactor screws will burn out.
Check for it being a leak by shutting the water off right after the pump (in an ideal world, you should have a cut off valve before and after the pump.) If it is still cycling with no change in pressure, then there is a problem with the pressure switch.
Shut the power off to the unit. There should be a gray or blue cover over the switch about 2"x3" held down with a small hex nut. If you lift it, you will see two vertical screw posts(one large, one small) with springs on them and four connectors about 1/4" diameter with a small gap between them. When the pump comes, on the connectors come together to complete the circuit. But because the gap is so small, it can arc when it is damp which can burn out the switch and stress the pump. If there is any blackening on the contacts, you need to have the pressure switch replaced(under $20 in the US)
If the contacts look good and if the weather hasn't been very too humid, the other place to check is the water feed to the pressure switch. This is a narrow copper pipe between the switch and the pump with large brass fittings on either end. If some debris partially clogs it, the pressure switch won't work properly. Shut the water and power off and undo the end closest to the switch. This will be a bit wet to do. Turn the water on enough to flush the line of any debris out and reconnect it(ideally with teflon thread tape).
Sometimes the problem will simply go away when the weather gets dryer. If you think it's dampness, I'd shut the power to the pump off so it's not arcing when you're away for the day. A small fan to reduce condensation may work too, but I've never tried it.
If none of this works and there is pressure loss without an visible leak, then try replacing any
check valves. A check valve is a one way valve. If the pump was not installed with a check valve and then you can lose pressure with water back washing through the pump. They can be identified with an arrow on the fitting pointing in the direction the water should be going and there
should be one right after the pump. They can be prone to failing with a bit of grit blocking them open.