A CPAP machine increases air pressure in your throat so that your airway doesn't collapse when you breathe in.

So you need to check the connections and if proper mask size and site

Also

The mechanism of CPAP is acting as air splint to avoid principal pharyngeal collapse during sleep. Consequently, extrapharyngeal collapse and significant pharyngeal obstructions can lower its compliance and lead to its failure. Adequate mask and pressure with thorough survey to eliminate side effects of CPAP from nasal, mask and flow-related problems are the prerequisite to improve CPAP compliance.

for more details you can visit :

Article How to manage continuous positive airway pressure (CPAP) fai...

Prof. Safaa ELMeneza,

Thank you for your nice comments.

As you said "Adequate mask and pressure with thorough survey to eliminate side effects of CPAP from nasal, mask and flow-related problems are the prerequisite to improve CPAP compliance".

I totally agree with your opinion.

Prof. Safaa ELMeneza,

Thank you very much for your response and professional comments.