Help sent emails getting cut off

[Android Question]

every so often i send an email to someone from my androids email app and the message gets cut off somewhere in the middle example:

hi buddy. It was great talking to you yesterd

i cant find any rhyme or reason to when this happens, it can be ok for a few weeks, then one day happen to one email or more then go away, seems entirely random

its causing terrible miscommunicatio ;-)

i only found one similar question online about it, but with no answer. here: https://productforums.google.com/forum/#!topic/gmail/hte02K16JxM

Addl Info

1. the messages are clipped also in my sent items folder (viewed in standard gmail on desktop browser), and also by the recipient in his inbox
   
   
2. im using the standard email app. not the one from gmail.

please advise