i dont think so, just tried one more time and same problem. Trex is working 24/7 and no any problems with disconnects. Tried lolminer with eth on same nicehash server and it is working fine, no disconnects.

+---------------------------------------------------------+
|    _       _ __  __ _                   _   _____ _     |
|   | | ___ | |  \/  (_)_ __   ___ _ __  / | |___ // |    |
|   | |/ _ \| | |\/| | | '_ \ / _ \ '__| | |   |_ \| |    |
|   | | (_) | | |  | | | | | |  __/ |    | |_ ___) | |    |
|   |_|\___/|_|_|  |_|_|_| |_|\___|_|    |_(_)____/|_|    |
|                                                         |
|              This software is for mining                |
|              Autolykos V2                               |
|              Ethash, Etchash                            |
|              Equihash 144/5, 192/7, 210/9               |
|              BeamHash III                               |
|              ZelHash     (EquihashR 125/4/0)            |
|              Cuck(ar)oo 29                              |
|              Cuckaroo   30 CTX                          |
|              Cuckatoo   31/32                           |
|                                                         |
|                                                         |
|             Made by Lolliedieb, July 2021               |
+---------------------------------------------------------+

Setup Miner...
OpenCL driver detected.
Number of OpenCL supported GPUs: 2
Cuda driver detected.
Number of Cuda supported GPUs: 1
Device 0:
    Name:    GeForce RTX 3060
    Address: 1:0
    Vendor:  NVIDIA Corporation
    Drivers: Cuda
    Memory:  12288 MByte
    Active:  true (Selected Algorithm: Autolykos V2 (Ergo) 3G Cuda)
Device 1:
    Name:    Intel(R) HD Graphics 4600
    Address: 4294967295:4294967295
    Vendor:  Intel(R) Corporation
    Drivers: OpenCL
    Memory:  1629 MByte
    Active:  false (not selected)

Connecting to pool...
Connected to autolykos.eu-north.nicehash.com:3390  (TLS disabled)
Subscribed to stratum server
Authorized worker: xxxxxxxxxxxxxx.3060
New job received: 00000000b513e27b Height: 529686 Target: 00000000C367CFE5...
Start Mining...
Lost connection to stratum server autolykos.eu-north.nicehash.com:3390 or server not reachable.
Trying to connect in 1 second
Connected to autolykos.eu-north.nicehash.com:3390  (TLS disabled)
Subscribed to stratum server
Authorized worker: xxxxxxxxxxxxxx.3060
New job received: 000000002c6af81e Height: 529686 Target: 0000000112E0BE82...
GPU 0: building Ergo dataset for height 529686 completed (2799 ms)
New job received: 000000002c6af81f Height: 529687 Target: 0000000112E0BE82...
GPU 0: building Ergo dataset for height 529687 completed (2778 ms)
GPU 0: Found a share of difficulty 217.36G
GPU 0: Share accepted (22 ms)
New job received: 000000002c6af820 Height: 529688 Target: 0000000112E0BE82...
GPU 0: building Ergo dataset for height 529688 completed (2800 ms)
15:53:44 Average speed (60s): 100.63 mh/s
GPU 0: Found a share of difficulty 7.24G
GPU 0: Share accepted (25 ms)
Lost connection to stratum server autolykos.eu-north.nicehash.com:3390 or server not reachable.
Trying to connect in 1 second
Connected to autolykos.eu-north.nicehash.com:3390  (TLS disabled)
Subscribed to stratum server
Authorized worker: xxxxxxxxxxxxxx.3060
New job received: 000000003ba07a75 Height: 529688 Target: 00000000C367CFE5...
GPU 0: Found a share of difficulty 6.64G
GPU 0: Share accepted (18 ms)