About Leonet speed, we cannot say that definitely because it is always changing by your using circumstance, network, server status etc.
We cannot also insure the lowest speed, so we will appreciate your understanding.
If your internet disconnect frequently, it may caused by network disturbance.
LEONET - Internet department: 0120-911-521
【Working hours】 Japanese: 24 hours. / English ・ Vietnamese: 10:00～19:00.