gramjs: Error: Cannot send requests while disconnected. You need to call .connect()

My app work fine, but sometimes it fall down with error:

Error: Cannot send requests while disconnected. You need to call .connect(), which begin run in endless cycle

then script die with another error:

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory

so my question is:

what is the bug with this:

Error: Cannot send requests while disconnected. You need to call .connect() ?

Why this sometimes run in endless cycle and never end? This definitely need to be fixed.

This bug was in version 2.5.* and now in 2.6.13 it has too.

Full error look like this:

Error: Cannot send requests while disconnected. You need to call .connect()
    at MTProtoSender.send (/code/node_modules/telegram/network/MTProtoSender.js:197:19)
    at Object.invoke (/code/node_modules/telegram/client/users.js:31:36)
    at async TelegramClient.getDC (/code/node_modules/telegram/client/TelegramClient.js:1120:28)
    at async TelegramClient._connectSender (/code/node_modules/telegram/client/telegramBaseClient.js:200:20)
    at async TelegramClient._borrowExportedSender (/code/node_modules/telegram/client/telegramBaseClient.js:243:22)

p.s.: right before this error it show this:

Error: Disconnect 
 at /code/node_modules/telegram/extensions/MessagePacker.js:106:33 
 at Array.forEach (<anonymous>) 
 at MessagePacker.rejectAll (/code/node_modules/telegram/extensions/MessagePacker.js:105:29) 
 at MTProtoSender._disconnect (/code/node_modules/telegram/network/MTProtoSender.js:247:25) 
 at MTProtoSender.disconnect (/code/node_modules/telegram/network/MTProtoSender.js:168:20) 
 at MTProtoSender._reconnect (/code/node_modules/telegram/network/MTProtoSender.js:728:24) 
 at /code/node_modules/telegram/network/MTProtoSender.js:721:22

Thanks.