Internet Connection loss after losing connection between 2 sites

Hello,
I have started working for a company over a year ago and recently we are running into an issue with losing internet after a loss of connection between companies site.  Below is a summary of setup.
Company has 2 locations, Site A and Site B..both same domain
Site A has DC and other servers such as ERP, Document Control Software.
Site B has DC, Printer Server, File Server and other essentials servers.
Each site has own independed 20 MB connection.
Site A and B are linked via MPLS and only used for ERP, Document Control software, and DC traffic.
Recently we started to have frequent connection issues with the MPLS and as a result I started to notice none of the users at Site B can access the internet such as google.com, msn.com...etc. As soon as MPLS connection is restored interent works.
The DC at Site B was setup before I started working for company.
I have been trying for the past few days to figure out why Site B is losing connection when MPLS Tunnel is not operational...but so far no luck.
I am very sure that internet traffic is not routed via MPLS because when internet is working the IP lookup such as "whatismyipaddress.com" points to ISP IP address for site B. Also when doing tracert to external website the route is via ISP for
Site B.
I think this issue is related to DNS but cannot tell the cause or how to fix? 
Thanks for assistance in advance.

Hi 
Having said internet is not routing via MPLS, Even i think to be a DNS issues,
Try to check the below
Ensure all the client DNS is set to AD DNS server 
In AD DNS server ensure its not forwarding DNS query to Other site 
During outage check any client PC manually changing the DNS IP to 4.2.2.2
- all client DNS are set to AD DNS server
- I checked the properties for the AD DNS and found there are 3 forwarders listed.
The first IP is at Site A which is resolved.
The second IP I am not sure about since it is not even in our subnet (not resolved)
The 3rd IP seemed to be for an old DC that is no longer operational (not resolved).
- During outage if I change client machine DNS to 8.8.8.8 or 4.2.2.2 they can access the internet.
I guess my issue is with the forwarders. Would the right step be remove all 3 forwarded and add 8.8.8.8 and 4.2.2.2?
Thanks.

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