square dropping transaction??

just wondering if anyone else had any trouble with square or any of the other c.c readers. for a couple days my transactions are taking along time to process, swipe the card it vibrates to tell me its authorizing but it takes a long time to authorize i've had couple times it has dropped the transaction all together.. i've also had a couple times when it charged the customer twice!I have the same customers every day about, when the line is 5-8 deep so most times when I feel the vibration I say "ok your all set"only to have to tell them it didnt go thru ..most will tell me cause they keep track also. i've got a call into square but thought id give all a heads up... with that said alot of people are having trouble with cell phones mostly sprint but I have a virgin mobile service but I also here that some companys share the same towers? maybe thats the trouble..