Adafruit connection OSError: -1

[Vicky_]

Im trying to post current sensor value to adafruit. it works great for about 5 mins then i get the error OSError:-1

below are my coding from line 152 to 165:

try:                                                
    while 1:
            client.check_msg()
            gc.collect()
            acq = Acquire(50) # 50 Hz
            value = acq.reading("P13", 500)
            
            value = round(value, 1)
            current = value
            post_var("pycom", current)
            gc.collect()
            time.sleep(1)
finally: 
          client.disconnect()

I already use gc.collect() but the result is same.
thank you.