if lte.is attached() makes it think it's not

[kjm]

I can run this program repeatedly & it works OK

import time, pycom, machine
import urequests as requests
from network import LTE
lte = LTE()
pycom.heartbeat(False)

def getLTE():
  if lte.isconnected(): return lte
  if not lte.isattached():
    print('attaching ', end=''); lte.attach()
    while not lte.isattached(): print('.', end=''); time.sleep(1)
  if not lte.isconnected():
    print('connnecting ', end=''); lte.connect()
    while not lte.isconnected(): print('.', end=''); time.sleep(1)
  return lte

getLTE()
r=requests.get('http://micropython.org/ks/test.html'); print(r.text)
lte.disconnect()

But if I add one extra line to check the modem is still attached

import time, pycom, machine
import urequests as requests
from network import LTE
lte = LTE(); rtc = RTC()
pycom.heartbeat(False)

def getLTE():
  if lte.isconnected(): return lte
  if not lte.isattached():
    print('attaching ', end=''); lte.attach()
    while not lte.isattached(): print('.', end=''); time.sleep(1)
  if not lte.isconnected():
    print('connnecting ', end=''); lte.connect()
    while not lte.isconnected(): print('.', end=''); time.sleep(1)
  return lte

getLTE()
r=requests.get('http://micropython.org/ks/test.html'); print(r.text)
if lte.isattached(): pycom.rgbled(0x007f00)
lte.disconnect()

it won't run a second time. On the second run it behaves like it thinks it's not attached. It looks like asking if it's attached makes it think it's not?!

attaching Traceback (most recent call last):
  File "<stdin>", line 18, in <module>
  File "<stdin>", line 11, in getLTE
OSError: the requested operation failed