<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><font face="sans-serif">Double check to make sure the mic bias jumper is not in place. If so, your mic element may be heating up over time. </font><div><font face="sans-serif" dir="auto"><br></font></div><div><font face="sans-serif" dir="auto">Eric</font></div><div><font face="sans-serif" dir="auto">K2CB</font></div><div><font face="sans-serif" dir="auto"><br></font></div>