LTE GSM WWAN problem Fibocom L831 @ lenovo x270

[zaaak2]

Witam.
Posiadam nowo zainstalowany system mint ubuntu 21 na laptopie lenovo x270.
Mam problem z wbudowanym modemem WWAN . System poprawnie widzi go , potrafię utworzyć nowe połączenie ale z chwilą gdy w network manager wybieram połączenie LTE, modem zaczyna się wyłączać/włączać i tak na przemian.

wycinek z dmesg +inxi

[ 453.683543] usb 1-3: new high-speed USB device number 5 using xhci_hcd
[ 453.840773] usb 1-3: New USB device found, idVendor=2cb7, idProduct=0202, bcdDevice= 0.00
[ 453.840777] usb 1-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 455.706280] usb 1-3: USB disconnect, device number 5
[ 460.459503] usb 1-3: new high-speed USB device number 6 using xhci_hcd
[ 460.620620] usb 1-3: New USB device found, idVendor=2cb7, idProduct=0002, bcdDevice=17.29
[ 460.620624] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 460.620626] usb 1-3: Product: L831-EAU-00
[ 460.620628] usb 1-3: Manufacturer: FIBOCOM
[ 460.620629] usb 1-3: SerialNumber: 004999010640000
[ 460.692609] cdc_mbim 1-3:1.0: setting rx_max = 16384
[ 460.693588] cdc_mbim 1-3:1.0: cdc-wdm0: USB WDM device
[ 460.693914] cdc_mbim 1-3:1.0 wwan0: register 'cdc_mbim' at usb-0000:00:14.0-3, CDC MBIM, 7e:21:e3:5d:b6:ca
[ 460.696513] cdc_acm 1-3:1.2: ttyACM0: USB ACM device
[ 463.984407] cdc_mbim 1-3:1.0: nonzero urb status received: -EPIPE
[ 463.984724] cdc_mbim 1-3:1.0: nonzero urb status received: -EPIPE
[ 464.909959] cdc_mbim 1-3:1.0: nonzero urb status received: -EPIPE
[ 464.910157] cdc_mbim 1-3:1.0: nonzero urb status received: -EPIPE
[ 464.917086] cdc_mbim 1-3:1.0: nonzero urb status received: -EPIPE
[ 464.917257] cdc_mbim 1-3:1.0: nonzero urb status received: -EPIPE


inxi -Fxz
System:
Kernel: 5.4.0-88-generic x86_64 bits: 64 compiler: gcc v: 9.3.0
Desktop: Cinnamon 5.0.5 Distro: Linux Mint 20.2 Uma
base: Ubuntu 20.04 focal
Machine:
Type: Laptop System: LENOVO product: 20HMS04P11 v: ThinkPad X270
serial: <filter>
Mobo: LENOVO model: 20HMS04P11 v: SDK0J40697 WIN serial: <filter>
UEFI: LENOVO v: R0IET56W (1.34 ) date: 01/22/2019
Battery:
ID-1: BAT0 charge: 17.7 Wh condition: 21.6/24.0 Wh (90%)
model: SMP 01AV459 status: Discharging
ID-2: BAT1 charge: 1.1 Wh condition: 19.5/23.5 Wh (83%) model: LGC 45N1127
status: Unknown
CPU:
Topology: Dual Core model: Intel Core i7-7600U bits: 64 type: MT MCP
arch: Amber Lake rev: 9 L2 cache: 4096 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
bogomips: 23199
Speed: 800 MHz min/max: 400/3900 MHz Core speeds (MHz): 1: 800 2: 800
3: 800 4: 800
Graphics:
Device-1: Intel HD Graphics 620 vendor: Lenovo driver: i915 v: kernel
bus ID: 00:02.0
Display: x11 server: X.Org 1.20.11 driver: modesetting
unloaded: fbdev,vesa resolution: 1920x1080~60Hz
OpenGL: renderer: Mesa Intel HD Graphics 620 (KBL GT2) v: 4.6 Mesa 21.0.3
direct render: Yes
Audio:
Device-1: Intel Sunrise Point-LP HD Audio vendor: Lenovo
driver: snd_hda_intel v: kernel bus ID: 00:1f.3
Sound Server: ALSA v: k5.4.0-88-generic
Network:
Device-1: Intel Ethernet I219-LM vendor: Lenovo driver: e1000e v: 3.2.6-k
port: efa0 bus ID: 00:1f.6
IF: enp0s31f6 state: down mac: <filter>
Device-2: Intel Wireless 8265 / 8275 driver: iwlwifi v: kernel port: efa0
bus ID: 03:00.0
IF: wlp3s0 state: up mac: <filter>
IF-ID-1: wwan0 state: down mac: <filter>
Drives:
Local Storage: total: 476.94 GiB used: 8.36 GiB (1.8%)
ID-1: /dev/sda vendor: SanDisk model: SD8SN8U-512G-1006 size: 476.94 GiB
Partition:
ID-1: / size: 365.68 GiB used: 8.34 GiB (2.3%) fs: ext4 dev: /dev/sda5
ID-2: swap-1 size: 6.75 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda6
Sensors:
System Temperatures: cpu: 51.0 C mobo: N/A
Fan Speeds (RPM): cpu: 4491
Info:
Processes: 219 Uptime: 38m Memory: 15.52 GiB used: 1.16 GiB (7.5%)
Init: systemd runlevel: 5 Compilers: gcc: 9.3.0 Shell: bash v: 5.0.17
inxi: 3.0.38

Dodam, że modem jest sprawny pod Win10 działa poprawnie.

Proszę o pomoc.
dziękuję i pozdrawiam zaaak