Телеграм бот засыпает, если долго не писать

import telebot
from datetime import datetime, timedelta
import time
import schedule
from threading import Thread
 
token = 'TOKEN'
bot = telebot.TeleBot(token)
 
USERS = []
class User:
    first_name = ""
    username = ""
    chat_id = ""
    stage = -1
    date = ""
 
def create_new_user(first_name, username, chat_id):
    global USERS
    new_user = User()
    new_user.first_name = first_name
    new_user.username = username
    new_user.chat_id = chat_id
    USERS.append(new_user)
 
def get_user_id(first_name, username, chat_id):
    global USERS
    user_id = 0
    for user in USERS:
        if user.chat_id == chat_id:
            break
        user_id += 1
    else:
        create_new_user(first_name, username, chat_id)
 
    return user_id
 
def make_keyboard(button):
    keyboard = telebot.types.InlineKeyboardMarkup()
    callback_button = telebot.types.InlineKeyboardButton(text=button, callback_data=button)
    keyboard.add(callback_button)
    return keyboard
 
 
@bot.message_handler(content_types=["text"])
def any_msg(message):
    print("message")
    global USERS
    text = message.text
    chat_id = str(message.chat.id)
    username = message.chat.username
    first_name = message.chat.first_name
    message_id = message.message_id
    user_id = get_user_id(first_name, username, chat_id)
    stage = USERS[user_id].stage
 
 
    if stage == -1:
        bot.send_message(chat_id, """Привет! Отправлю тебе 4 сообщения. 
Готов?""", reply_markup=make_keyboard("Да"))
        USERS[user_id].stage+=1
 
 
@bot.callback_query_handler(func=lambda call: True)
def callback_inline(call):
    global USERS
    text = call.data
    message_id = call.message.message_id
    chat_id = str(call.message.chat.id)
    username = call.message.chat.username
    first_name = call.message.chat.first_name
    user_id = get_user_id(first_name, username, chat_id)
    stage = USERS[user_id].stage
    if stage == 0:
        bot.edit_message_text(chat_id = chat_id, message_id = message_id, text = call.message.text)
        bot.send_message(chat_id, "Сообщение")
        date = (datetime.utcfromtimestamp(call.message.date) + timedelta(minutes = 30)).strftime('%Y-%m-%d %H:%M:%S')
        USERS[user_id].date = date
        USERS[user_id].stage += 1
        print(date)
 
def check_date():
    print("check")
    global USERS
    for user in USERS:
 
            if user.stage == 1:
                if datetime.strptime(user.date, '%Y-%m-%d %H:%M:%S') < datetime.utcnow():
                    bot.send_message(user.chat_id, "1 сообщение")
                    user.date = (datetime.utcnow() + timedelta(minutes = 30)).strftime('%Y-%m-%d %H:%M:%S')
                    user.stage+=1
 
            elif user.stage == 2:
                if datetime.strptime(user.date, '%Y-%m-%d %H:%M:%S') < datetime.utcnow():
                    bot.send_message(user.chat_id, "2 сообщение")
                    user.date = (datetime.utcnow() + timedelta(minutes = 30)).strftime('%Y-%m-%d %H:%M:%S')
                    user.stage+=1
 
            elif user.stage == 3:
                if datetime.strptime(user.date, '%Y-%m-%d %H:%M:%S') < datetime.utcnow():
                    bot.send_message(user.chat_id, "3 сообщение")
                    user.stage+=1
 
 
 
def telegram_polling():
    try:
        bot.polling(none_stop=True, timeout=60)
    except:
        bot.stop_polling()
        time.sleep(5)
        telegram_polling()
 
 
 
def scheduler():
    schedule.every(10).seconds.do(check_date)
    while True:
        schedule.run_pending()
        time.sleep(1)
 
if __name__ == '__main__':
    t = Thread(target=scheduler)
    t.start()
    telegram_polling()

if __name__ == '__main__':
    while True:
        try:
            bot.polling(none_stop=True)
        except Exception as e:
            time.sleep(3)
            print(e)