Please kindly find the error as below, using android mobile client, it seems that when the throughput is over 3-4Mbps, then the connection start to drop.
Feb 21 17:35:28 openvpn[99575]: calvin/182.239.65.158:47055 Connection reset, restarting [0]
Feb 21 17:35:30 openvpn[99575]: TCP connection established with [AF_INET]182.239.65.158:36451
Feb 21 17:35:34 openvpn: user 'xxxx' authenticated
Feb 21 17:35:35 openvpn[99575]: 182.239.65.158:36451 [xxxx] Peer Connection Initiated with [AF_INET]182.239.65.158:36451
Feb 21 17:35:35 openvpn[99575]: xxxx/182.239.65.158:36451 MULTI_sva: pool returned IPv4=10.10.111.10, IPv6=(Not enabled)
Feb 21 17:35:36 openvpn[99575]: xxxx/182.239.65.158:36451 send_push_reply(): safe_cap=940