those are just rumors. technically, if your i20 is valid and has not yet expired, you are/should be allowed to enter the US even if you have only 1 day remaining in your visa. you can check this on any .gov pages. however, you never know what's going to happen at the port of entry, so it's safe to enter with a new visa. i am in similar boat as well. but to be on the safe side, i am applying for a new visa when i go home this april. and then return to the US.