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For a memory leak, yes upgrading the IOS might fix. You would need to see if your memory leak is a known defect, and whether it has been corrected.
"Best solution" is it depends. If you're using some feature that uses lots of memory, do you need to use it in the manner your are. For example, with NetFlow, you can set how quickly data expires or you can used summarized stats.
Another common solution is to determine whether you model router can be memory upgraded. If so, just add RAM.
