Seeing different first hops in a traceroute output made on the same machine can be caused by multiple issues in your network configuration. It's possible that you have multiple default routes on your client PC and the PC is configured for equal-cost multipath (load-sharing). This can be enabled on some network interfaces since Windows 7, have a look at the output of route print. How many interfaces with IPs do you have on the client?
Secondly, it's possible that you have actually two physical routers (mis)configured for first-hop redundancy and during failover you are seeing two different IPs in traceroute, although they shouldn't be from different IP subnets. Is one of the 1st hop IPs configured as a secondary IP on the LAN interface of your default gateway?
Finally have a look at your IP configuration on the client. Is it possible that your PC is migrating between VLANs and receiving new IP / default gateway information from DHCP whenever that happens? VLAN (or WLAN) membership can change automatically and sometimes without user knowledge.
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Policy Administration Node
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About this Document
Cisco Secure Endpoint (formerly AMP for Endpoints) is a comprehensive Endpoint Security solution designed to function both as a stand-alone tool, and as a part of the architecture of natively integrated Cisco and 3rd par...