This does sound like a faulty shutter-release switch, but the cause could be either mechanical/contact wear or an electronic fault in the button circuit. On compact cameras, the shutter button is typically a small switch mounted on a circuit board, so there usually isn’t a simple external adjustment.

Opening the camera may help only if you’re comfortable with delicate electronics. Be careful: cameras can contain a high-voltage flash capacitor, which can give a severe shock. Also, disassembly can be difficult without a service manual, and reassembly may be frustrating.

If the problem is just dirty or oxidized contacts, exercising the button gently from different angles might help temporarily, but there’s no guaranteed “wiggle fix.” If the switch itself is worn, replacement is the real fix.

Practically speaking, for an older compact like the Optio M10, repair may not be economical compared with replacing the camera or finding a donor body for parts. If you do attempt repair, document the disassembly carefully and only proceed if you’re confident working around small ribbon cables and charged components.