Transmit error in 2621 router

Dear All,
I got the following errors from my cisco 2621 router - the network connection between our ISP and our router suddenly unstable and have packet lost. But after router reload, the problem will be resolved.
This error message does not show up from time to time but today it happen again. Last time this problem happened, i had checked with ISP engineer to make sure "Duplex & Speed" are the same between our router and their network switch.
From Cisco website, the problem explanation is "Possible causes are usually incorrect cabling or a non-compliant number of hubs in the network. Bad network interface cards (NICs) can also cause late collisions". I personally don't think this is the problem, so any other reason ? E.g. IOS version not stable ?
router>sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.0(3)T3, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Thu 15-Apr-99 15:41 by kpma
Image text-base: 0x80008088, data-base: 0x80693A88
ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
hkcyberu uptime is 6 hours, 9 minutes
System restarted by reload at 10:23:34 HKT Fri Apr 29 2005
System image file is "flash:c2600-i-mz.120-3.T3"
cisco 2621 (MPC860) processor (revision 0x102) with 24576K/8192K bytes of memory.
Processor board ID JAD04420INF (3795023180)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
2 FastEthernet/IEEE 802.3 interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read/Write)
Configuration register is 0x2102
Error message:
"%AMDP2_FE-5-LATECOLL: FastEthernet0/1 transmit error" & "%AMDP2_FE-3-UNDERFLO: FastEthernet0/1 transmit error
Alex Leung

Hello Alex,
just to make sure: when you say that you have checked speed and duplex settings on both sides, does that mean that both sides are set to fixed full duplex and speed settings (no autonegotiate) ?
As for the UNDERFLO error message, this is what CCO says:
Error Message
%AMDP2_FE-3-UNDERFLO: AMDP2/FE([dec]/[dec]), Transmit underflow
Explanation While transmitting a frame, the controller chip's local buffer received insufficient data because data could not be transferred to the chip fast enough to keep pace with its output rate. Normally, such a problem is temporary, depending on transient peak loads within the system.
Recommended Action The system should recover. No action is required.
Regards,
GP

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Hi Ankur
Seems to be ok after config change. Shall continue to monitor. Many thank for your excellant advise
Regards Bandula
pcmb127#sh int fastEthernet 0/0
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pcmb127#

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HI, [PLS RATE if HELPS]
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Transmit error in 2621 router

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