The number one issue with hearing aids is wax.
Even if you just cleaned it, the first thing to do when your hearing aids stop working properly is to clean the tubing, tip, and microphone ports. If your hearing aid isn't properly cleaned, you won't be able to hear. It doesn't matter if you spent thousands of dollars on hearing aids at a hearing clinic, or if you saved thousands of dollars with Vivtone hearing aids. Give it a nice cleaning. That should solve the issue 95% of the time!