Sorry for the inconvenience it caused to you. To better analyse your issue, we would like to d some trouble shootings with you first.
1. Please check if your batteries inside the timer are in good condition. If batteries are exhausted, the connection will be lost.
2.Please try to put the timer closer to the timer and check if the issue still exist. If you put it closer to the timer and the connection gets better. It is the distance issue.
3.Please check if the battery unit is rusty. If the battery unit is rusty, the power supply might not stable and it will cause connection issue.
4.Please let know how many timers in total you connect with one hub. Kindly note one hub can only connect with 4 timers. If your wifi signal is not strong, you need to reduce the timer amount.
5.Please check if the timer works as programmed even it is offline. Normally, the timer will work as programmed even it is offline.
If the timer is in good condition, it will connect to the hub auto if the wifi is cut off and restore. Please check and let know the situation of the timer. Please do not worry about it, if everything is good but you the issue still exist, you can email to service@rainpointus.com for further support.