Too many archive log files

I find on my Oracle server database, suddenly an increase in number of archive log files on Log Switch. My group size was set to 2 and the file size was set to 5 Mb. I increased file size to 20 Mb and group size to 4. Now I have only 1 or 2 archive log files but still the reason for sudden increase in archive log files or whether this step is really the right way is not clear.

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