Error code 1279 despite using ethernet

I'm using the labjack in streaming mode via python, streaming 5 ain ports. When I tried by USB, I could only ever get 15 seconds of data (nearly precisely) before it threw error 1279. I've got it hooked up to ethernet now, and it goes for much longer (about 5 mins), but eventually still throws error 1279. Any ideas what I could do to avoid that error? Here's the code I'm running as a minimal example:

import sys
import time
from labjack import ljm

all_ain = ['AIN0','AIN1','AIN2','AIN3','AIN4']

adc_res = 0 #0: fastest
adc_rate = 100000/len(all_ain) #asks adc to go full-speed given the # of ains
secs_per_read = .1 #how frequently eStreamRead will yield values

handle = ljm.open(ljm.constants.dtT7, ljm.constants.ctETHERNET, "ANY")

scansPerRead = int(adc_rate*secs_per_read)
ljm.eWriteName(handle, 'AIN_ALL_RANGE', 10)
ljm.eWriteName(handle, 'STREAM_SETTLING_US', 0)
ljm.eWriteName(handle, 'STREAM_RESOLUTION_INDEX', adc_res)
ain_addresses = ljm.namesToAddresses(len(all_ain),all_ain)[0]
adc_rate = ljm.eStreamStart(handle, scansPerRead, len(all_ain), ain_addresses, adc_rate)
stream_start_time = time.time()
print("Stream started at "+str(adc_rate)+"Hz")

while True:
    #read from device
    try:
        vals,device_backlog,ljm_backlog = ljm.eStreamRead(handle)
    except Exception as e:
        print(e)
        print(time.time()-stream_start_time)
        ljm.close(handle)
        sys.exit()