# Implement blade is intermittently jumping up or attempting to deep dive.

<span data-identifyelement="499" dir="ltr" style="font-size: 14pt; font-family: Helvetica, sans-serif; color: rgb(0, 0, 0); font-weight: 400;">**Symptoms**:</span><span data-identifyelement="501" style="font-family: Helvetica,sans-serif;"><span data-identifyelement="502" style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 300;"> </span></span>

<span data-identifyelement="504" style="font-family: Helvetica,sans-serif;"><span data-identifyelement="505" style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 300;">Work is progressing normally but occasionally the blade will suddenly rise up, or attempt to aggressively dig.</span></span>

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<span data-identifyelement="510" style="font-family: Helvetica,sans-serif;"><span data-identifyelement="511" style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 400;">**Possible Cause**:</span></span>

- <span data-identifyelement="514" style="font-family: Helvetica,sans-serif;"><span data-identifyelement="515" dir="ltr" style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 300;">A bad USB-to-Serial conversion dongle/adapter is causing corrupted height commands to be sent to iGrade. This can be diagnosed by checking the I/O Voltages page on the iGrade display and observing the last received messages. Occasionally you may see values being received to be truncated or otherwise corrupted.</span></span>
- <span data-identifyelement="514" style="font-family: Helvetica,sans-serif;"><span data-identifyelement="515" dir="ltr" style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 300;">Base receiver could have an intermittent failure. See [Sudden Vertical Shifts](https://t3rra.freshdesk.com/support/solutions/articles/51000451550).</span></span>

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<span data-identifyelement="520" style="font-family: Helvetica,sans-serif;"><span data-identifyelement="521" style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 400;">**Solution**:</span></span>

1. <span data-identifyelement="525" style="font-family: Helvetica,sans-serif;"><span data-identifyelement="526" style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 300;">Replace your USB-to-Serial cable with the one recommended. - FTDI US232R.</span></span>
2. <span data-identifyelement="528" style="font-family: Helvetica,sans-serif;"><span data-identifyelement="529" dir="ltr" style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 300;">Contact T3RRA or your dealer for a recommended make and model.</span></span>

<span data-identifyelement="531" style="font-family: Helvetica,sans-serif;"><span data-identifyelement="532" dir="ltr" style="font-size: 14pt; color: rgb(0, 0, 0); font-weight: 300;">![](https://docs.t3rra.com/uploads/images/gallery/2025-03/scaled-1680-/ebfp4ran1nscflbr4sk9xvdx5hwpnnk8nw-png.png)</span></span>

Ps