I have two toilets back to back on the same level; one in the main hall bathroom and the other in the master bedroom's bathroom. Both toilets when they are flushed are not flushing correctly and they both fill up almost to the lip of the toilet and then over a short period of about two to three minutes, drain down to the point where is barely a pint of water on the bottom of the bowl. I do not know if our recent cold snap has anything to do with this as we are in the Florida Keys and our plumbing is exposed under the house as we are in a stilt house. Any help would be appreciated.