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Issues with Hosted 3CX

We recently moved to a hosted 3cx phone system.   Ever since we moved to the new system we have had problems with the phones.   Dropped calls, incoming calls not ringing, no audio on one end, no dial tone, etc.  

The provider has worked to resolve the issue.   First they discovered that we were maxing out our bandwidth so we increased it.   After we still had issues they decided it was our routers/switches and they replaced and configured all switches, routers and firewalls with their preferred vendor.   We still had problems so they blamed it on the DHCP server and assigned static IPs to all the phones.  When that didn't resolve the issues they blamed the DNS server and changed the DNS server from the internal DNS server to Google which did not help either.    

Has anyone else had similar issues?   Are there any suggestions?
IP TelephonyTelecommunicationsVoice Over IP

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Voice Over IP
Voice Over IP

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN). Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).

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