Exception возвращает TimeoutError()

В функции в некоторых случаях срабатывает исключение Exception as ex = Timeout(). Ошибка странная, потому что если бы была проблема сетевая то сработало бы исключение ccxt.NetworkError. Как определить истинную причину исключения?

async def FetchTrades(exchange, pair, since, till, limit=1000, attempts = 3, sleep = 60):
    networkError = 0
    fetchError = 0

    while networkError < attempts:
        try:
            trades = []
            #id = await FindNearestFromId(exchange, pair, since)
            preLoad = await exchange.fetchTrades(symbol = pair, since=since, limit = 1)
            if(preLoad == None or len(preLoad) == 0):
                preLoad = await exchange.fetchTrades(symbol = pair, since=(since - 10 * 24 * 60 * 60 * 1000), limit = 1)
                if(preLoad == None or len(preLoad) == 0):
                    return (pair, trades, since, till)

            id = int(preLoad[0]['id'])


            while int(preLoad[0]['timestamp']) > since:
                id = int(preLoad[0]['id'])
                fromID = (id - limit) if(id > limit) else 1
                id = fromID
                preLoad = await exchange.fetchTrades(symbol = pair, params={'fromId':str(fromID)}, limit = 1)
            
            prev_id = -1
            tradesPage = None

            while True:

                tradesPage = await exchange.fetchTrades(symbol = pair, params={'fromId':str(id)}, limit = limit)

                if(tradesPage != None and len(tradesPage)):

                    prev_id = id
                    id = tradesPage[-1]['id']

                    tradesPageCleaned = list(map(lambda x: (x['symbol'], dt.datetime.strptime(x['datetime'], '%Y-%m-%dT%H:%M:%S.%fZ'),x['timestamp'], int(x['id']), x['side'], x['price'], x['amount'], x['cost'], x['fee']), tradesPage))  
                    trades = trades + tradesPageCleaned

                    if(prev_id == id):
                        break

                    if(tradesPage[-1]['timestamp'] >= till):
                        break
                else:
                    break
            
            tradesFiltered = list(filter(lambda x: x[2] >= since and  x[2] < till, trades))

            return (pair, tradesFiltered, since, till)

        except ccxt.NetworkError as ex:
            log.error("{}, {}".format(sys._getframe().f_code.co_name, ex))
            networkError = networkError + 1

            if(networkError >= attempts):
                raise Exception(ex)

            log.warning("{}: sleep {} seconds".format(sys._getframe().f_code.co_name, sleep))
            time.sleep(sleep) 

        except Exception as ex: 
            log.error("{}, {}".format(sys._getframe().f_code.co_name, ex))
            raise Exception(ex)