If your auto attendant intermittently fails when callers press menu selections, the issue is likely caused by DTMF (Dual-Tone Multi-Frequency) problems. Ensure your system supports RFC2833 rather than older inband DTMF.
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Inband: Digits are transmitted as audio tones without special coding or markers. On VoIP and SIP networks, inband DTMF is unreliable and is often the cause of menu failures.
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RFC2833: The preferred standard for signalling DTMF tones, fax-related tones, and country-specific subscriber line tones.