Check your /var/log/messages for signs of hardware failures. Also check other devices on the same sub-net that may be experiencing network interface hardware failures.
Check on the health of any networked applications that might be running on that system, including networked filesystems.
If the cause of the increased collisions can be narrowed to a particular application, such as NFS or Apache, consider tuning some system parameters for better application performance, such as increasing network buffers. This might also reduce network collisions.
Finally, if you are using wireline connections, double-check all your cable connections and their layout.
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