J.C.
Hi V.,
I dealt with this a couple years ago when my daughter was 21 months. She went four months having a fever every four weeks. Her highest temp was 105.5 that landed us in emergency because we could not get it down at home. Each month the duration of the fever went down until it didn't happen anymore. Fortunatley we have not had any problems since. She didn't have any other symptoms aside from the fever; my daughter doesn't slow down until she gets above 102. When I researched it a couple years ago there wasn't much information about it. Hopefully your sons will go away and not be an issue for his whole life. If you find out any information about it, please pass it my way.