Upgraded from v3.7.8 to 3.8.9.4_BT on a Vigor 2760n, since then the router has experienced various restarts and WAN connectivity loss, the uptime varies between 5 mins and 90 mins.

Noticed on the DSL Status, that were getting a large number of CRC errors on the upstream, anyone else seen this or experienced something similar, thanks in advance.

System Information
Model Name Vigor2760n
System Up Time 0:32:14
Router Name DrayTek
Current Time Thu Feb 27 2020 10:32:10
Firmware Version 3.8.9.4_BT
Build Date/Time Dec 25 2018 14:23:55
DSL Version 576D17_A/B/C HW: A
LAN MAC Address xx-xx-xx-xx-xx-xx

General DSL Status

ATU-R Information
Type: VDSL2
Hardware: Annex A
Firmware: xx-xx-xx-xx-xx-xx
Power Mngt Mode: DSL_G997_PMS_L0
Line State: SHOWTIME
Running Mode: 17A
Vendor ID: 00000000 00000000
ATU-C Information
Vendor ID: b5004244 434da4a1 [BDCM]
Line Statistics

Downstream Upstream
Actual Rate 48999 Kbps 14996 Kbps
Attainable Rate 71219 Kbps 17931 Kbps
Path Mode Fast Fast
Interleave Depth 1 1
Actual PSD 7. 7 dB 12. 5 dB
Near End Far End
Trellis ON ON
Bitswap ON ON
ReTx 1 1
SNR Margin 12 dB 7 dB
Attenuation 18 dB 23 dB
CRC 278 47581
FECS 0 s 12760 s
ES 81 s 11694 s
SES 49 s 2605 s
LOSS 0 s 0 s
UAS 27 s 8222 s
HEC Errors 0 0
RS Corrections 0 0
LOS Failure 0 0
LOF Failure 0 0
LPR Failure 0 0
NCD Failure 0 0
LCD Failure 0 0
NFEC 32 32
RFEC 16 16
LYSMB 16 16

Welcome to my world buddy, Draytek have no fucking clue for their tech support when I give them everything they need.
Even raised a forum post here to which they don't read.

2862 - had to use my 2960 with 130 modem and a 903 AP, my 2862 is sat in the box still - unusable.

I use 2760 (in bridge mode) with latest bt fw, and is solid rock, no disconnections at all, amount of errors seems normal on mine. The only difference is that I'm on ECI (IFTN) cabinet where you are on Huawei (BDCM), try disable vectoring in cli (can't find command right now) and see if that will help.

Thx mrk26, will give that a try.

Also I think is worth to try different modem code, the one you using is by default, there should be 574307 as well (on drop down list in wan settings) , switch between and see if other one is more g.inp friendly.